| | |
| | | -- SWITCHING STATION |
| | | -- The switching station is the center of all power distribution on an electric network. |
| | | -- |
| | | -- The station collects power from sources (PR), distributes it to sinks (RE), |
| | | -- and uses the excess/shortfall to charge and discharge batteries (BA). |
| | | -- |
| | | -- For now, all supply and demand values are expressed in kW. |
| | | -- |
| | | -- It works like this: |
| | | -- All PR,BA,RE nodes are indexed and tagged with the switching station. |
| | | -- The tagging is to allow more stations to be built without allowing a cheat |
| | | -- with duplicating power. |
| | | -- All the RE nodes are queried for their current EU demand. Those which are off |
| | | -- would require no or a small standby EU demand, while those which are on would |
| | | -- require more. |
| | | -- If the total demand is less than the available power they are all updated with the |
| | | -- demand number. |
| | | -- If any surplus exists from the PR nodes the batteries will be charged evenly with this. |
| | | -- If the total demand requires draw on the batteries they will be discharged evenly. |
| | | -- |
| | | -- If the total demand is more than the available power all RE nodes will be shut down. |
| | | -- We have a brown-out situation. |
| | | -- |
| | | -- Hence all the power distribution logic resides in this single node. |
| | | -- |
| | | -- Nodes connected to the network will have one or more of these parameters as meta data: |
| | | -- <LV|MV|HV>_EU_supply : Exists for PR and BA node types. This is the EU value supplied by the node. Output |
| | | -- <LV|MV|HV>_EU_demand : Exists for RE and BA node types. This is the EU value the node requires to run. Output |
| | | -- <LV|MV|HV>_EU_input : Exists for RE and BA node types. This is the actual EU value the network can give the node. Input |
| | | -- |
| | | -- The reason the LV|MV|HV type is prepended toe meta data is because some machine could require several supplies to work. |
| | | -- This way the supplies are separated per network. |
| | | -- See also technic/doc/api.md |
| | | |
| | | technic.networks = {} |
| | | technic.cables = {} |
| | | technic.redundant_warn = {} |
| | | |
| | | local mesecons_path = minetest.get_modpath("mesecons") |
| | | local digilines_path = minetest.get_modpath("digilines") |
| | | |
| | | local S = technic.getter |
| | | |
| | | local cable_entry = "^technic_cable_connection_overlay.png" |
| | | |
| | | minetest.register_craft({ |
| | | output = "technic:switching_station", |
| | | recipe = { |
| | | {"", "technic:lv_transformer", ""}, |
| | | {"default:copper_ingot", "technic:machine_casing", "default:copper_ingot"}, |
| | | {"technic:lv_cable0", "technic:lv_cable0", "technic:lv_cable0"} |
| | | {"", "technic:lv_transformer", ""}, |
| | | {"default:copper_ingot", "technic:machine_casing", "default:copper_ingot"}, |
| | | {"technic:lv_cable", "technic:lv_cable", "technic:lv_cable"} |
| | | } |
| | | }) |
| | | |
| | | local mesecon_def |
| | | if mesecons_path then |
| | | mesecon_def = {effector = { |
| | | rules = mesecon.rules.default, |
| | | }} |
| | | end |
| | | |
| | | minetest.register_node("technic:switching_station",{ |
| | | description = S("Switching Station"), |
| | | tiles = {"technic_water_mill_top_active.png", "technic_water_mill_top_active.png", |
| | | "technic_water_mill_top_active.png", "technic_water_mill_top_active.png", |
| | | "technic_water_mill_top_active.png", "technic_water_mill_top_active.png"}, |
| | | groups = {snappy=2, choppy=2, oddly_breakable_by_hand=2}, |
| | | tiles = { |
| | | "technic_water_mill_top_active.png", |
| | | "technic_water_mill_top_active.png"..cable_entry, |
| | | "technic_water_mill_top_active.png", |
| | | "technic_water_mill_top_active.png", |
| | | "technic_water_mill_top_active.png", |
| | | "technic_water_mill_top_active.png"}, |
| | | groups = {snappy=2, choppy=2, oddly_breakable_by_hand=2, technic_all_tiers=1}, |
| | | connect_sides = {"bottom"}, |
| | | sounds = default.node_sound_wood_defaults(), |
| | | drawtype = "nodebox", |
| | | paramtype = "light", |
| | | node_box = { |
| | | type = "fixed", |
| | | fixed = {-0.5, -0.5, -0.5, 0.5, 0.5, 0.5}, |
| | | }, |
| | | on_construct = function(pos) |
| | | local meta = minetest.get_meta(pos) |
| | | meta:set_string("infotext", S("Switching Station")) |
| | | meta:set_string("active", 1) |
| | | meta:set_string("channel", "switching_station"..minetest.pos_to_string(pos)) |
| | | meta:set_string("formspec", "field[channel;Channel;${channel}]") |
| | | technic.redundant_warn.poshash = nil |
| | | end, |
| | | after_dig_node = function(pos) |
| | | minetest.forceload_free_block(pos) |
| | | pos.y = pos.y - 1 |
| | | minetest.forceload_free_block(pos) |
| | | technic.redundant_warn.poshash = nil |
| | | end, |
| | | on_receive_fields = function(pos, formname, fields, sender) |
| | | if not fields.channel then |
| | | return |
| | | end |
| | | local plname = sender:get_player_name() |
| | | if minetest.is_protected(pos, plname) then |
| | | minetest.record_protection_violation(pos, plname) |
| | | return |
| | | end |
| | | local meta = minetest.get_meta(pos) |
| | | meta:set_string("channel", fields.channel) |
| | | end, |
| | | mesecons = mesecon_def, |
| | | digiline = { |
| | | receptor = {action = function() end}, |
| | | effector = { |
| | | action = function(pos, node, channel, msg) |
| | | if msg ~= "GET" and msg ~= "get" then |
| | | return |
| | | end |
| | | local meta = minetest.get_meta(pos) |
| | | if channel ~= meta:get_string("channel") then |
| | | return |
| | | end |
| | | digilines.receptor_send(pos, digilines.rules.default, channel, { |
| | | supply = meta:get_int("supply"), |
| | | demand = meta:get_int("demand") |
| | | }) |
| | | end |
| | | }, |
| | | }, |
| | | }) |
| | | |
| | | -------------------------------------------------- |
| | | -- Functions to traverse the electrical network |
| | | -------------------------------------------------- |
| | | local function flatten(map) |
| | | local list = {} |
| | | for key, value in pairs(map) do |
| | | list[#list + 1] = value |
| | | end |
| | | return list |
| | | end |
| | | |
| | | -- Add a wire node to the LV/MV/HV network |
| | | local add_new_cable_node = function(nodes, pos) |
| | | -- Ignore if the node has already been added |
| | | for i = 1, #nodes do |
| | | if pos.x == nodes[i].x and |
| | | pos.y == nodes[i].y and |
| | | pos.z == nodes[i].z then |
| | | return false |
| | | end |
| | | -- Returns: indicator whether the cable is new in the network |
| | | local hash_node_position = minetest.hash_node_position |
| | | local function add_network_node(nodes, pos, network_id) |
| | | local node_id = hash_node_position(pos) |
| | | technic.cables[node_id] = network_id |
| | | if nodes[node_id] then |
| | | return false |
| | | end |
| | | table.insert(nodes, {x=pos.x, y=pos.y, z=pos.z, visited=1}) |
| | | nodes[node_id] = pos |
| | | return true |
| | | end |
| | | |
| | | -- Generic function to add found connected nodes to the right classification array |
| | | local check_node_subp = function(PR_nodes, RE_nodes, BA_nodes, SP_nodes, all_nodes, pos, machines, tier, sw_pos) |
| | | technic.get_or_load_node(pos) |
| | | local meta = minetest.get_meta(pos) |
| | | local name = minetest.get_node(pos).name |
| | | |
| | | if technic.is_tier_cable(name, tier) then |
| | | add_new_cable_node(all_nodes, pos) |
| | | elseif machines[name] then |
| | | --dprint(name.." is a "..machines[name]) |
| | | if machines[name] == technic.producer then |
| | | add_new_cable_node(PR_nodes, pos) |
| | | elseif machines[name] == technic.receiver then |
| | | add_new_cable_node(RE_nodes, pos) |
| | | elseif machines[name] == technic.producer_receiver then |
| | | add_new_cable_node(PR_nodes, pos) |
| | | add_new_cable_node(RE_nodes, pos) |
| | | elseif machines[name] == "SPECIAL" and |
| | | (pos.x ~= sw_pos.x or pos.y ~= sw_pos.y or pos.z ~= sw_pos.z) then |
| | | -- Another switching station -> disable it |
| | | add_new_cable_node(SP_nodes, pos) |
| | | meta:set_int("active", 0) |
| | | meta:set_string("active_pos", minetest.serialize(sw_pos)) |
| | | elseif machines[name] == technic.battery then |
| | | add_new_cable_node(BA_nodes, pos) |
| | | end |
| | | |
| | | meta:set_int(tier.."_EU_timeout", 2) -- Touch node |
| | | local function add_cable_node(nodes, pos, network_id, queue) |
| | | if add_network_node(nodes, pos, network_id) then |
| | | queue[#queue + 1] = pos |
| | | end |
| | | end |
| | | |
| | | -- Generic function to add found connected nodes to the right classification array |
| | | local check_node_subp = function(network, pos, machines, sw_pos, from_below, network_id, queue) |
| | | technic.get_or_load_node(pos) |
| | | local name = minetest.get_node(pos).name |
| | | |
| | | if technic.is_tier_cable(name, network.tier) then |
| | | add_cable_node(network.all_nodes, pos, network_id, queue) |
| | | return |
| | | end |
| | | |
| | | local eu_type = machines[name] |
| | | if not eu_type then |
| | | return |
| | | end |
| | | |
| | | --dprint(name.." is a "..machines[name]) |
| | | local meta = minetest.get_meta(pos) |
| | | meta:set_string(network.tier.."_network", minetest.pos_to_string(sw_pos)) |
| | | |
| | | if eu_type == technic.producer then |
| | | add_network_node(network.PR_nodes, pos, network_id) |
| | | elseif eu_type == technic.receiver then |
| | | add_network_node(network.RE_nodes, pos, network_id) |
| | | elseif eu_type == technic.producer_receiver then |
| | | add_network_node(network.PR_nodes, pos, network_id) |
| | | add_network_node(network.RE_nodes, pos, network_id) |
| | | elseif eu_type == technic.battery then |
| | | add_network_node(network.BA_nodes, pos, network_id) |
| | | elseif eu_type == "SPECIAL" and from_below and |
| | | not vector.equals(pos, sw_pos) then |
| | | -- Another switching station -> disable it |
| | | add_network_node(network.SP_nodes, pos, network_id) |
| | | meta:set_int("active", 0) |
| | | end |
| | | |
| | | meta:set_int(network.tier.."_EU_timeout", 2) -- Touch node |
| | | end |
| | | |
| | | -- Traverse a network given a list of machines and a cable type name |
| | | local traverse_network = function(PR_nodes, RE_nodes, BA_nodes, SP_nodes, all_nodes, i, machines, tier, sw_pos) |
| | | local pos = all_nodes[i] |
| | | local traverse_network = function(network, pos, machines, sw_pos, network_id, queue) |
| | | local positions = { |
| | | {x=pos.x+1, y=pos.y, z=pos.z}, |
| | | {x=pos.x-1, y=pos.y, z=pos.z}, |
| | |
| | | {x=pos.x, y=pos.y-1, z=pos.z}, |
| | | {x=pos.x, y=pos.y, z=pos.z+1}, |
| | | {x=pos.x, y=pos.y, z=pos.z-1}} |
| | | --print("ON") |
| | | for i, cur_pos in pairs(positions) do |
| | | check_node_subp(PR_nodes, RE_nodes, BA_nodes, SP_nodes, all_nodes, cur_pos, machines, tier, sw_pos) |
| | | check_node_subp(network, cur_pos, machines, sw_pos, i == 3, network_id, queue) |
| | | end |
| | | end |
| | | |
| | |
| | | end |
| | | end |
| | | |
| | | local get_network = function(sw_pos, pos1, tier) |
| | | local cached = technic.networks[minetest.hash_node_position(pos1)] |
| | | local get_network = function(sw_pos, cable_pos, tier) |
| | | local network_id = minetest.hash_node_position(cable_pos) |
| | | local cached = technic.networks[network_id] |
| | | if cached and cached.tier == tier then |
| | | -- Re-use cached system data |
| | | touch_nodes(cached.PR_nodes, tier) |
| | | touch_nodes(cached.BA_nodes, tier) |
| | | touch_nodes(cached.RE_nodes, tier) |
| | | for _, pos in ipairs(cached.SP_nodes) do |
| | | -- Disable all other switching stations (again) |
| | | local meta = minetest.get_meta(pos) |
| | | meta:set_int("active", 0) |
| | | meta:set_string("active_pos", minetest.serialize(sw_pos)) |
| | | end |
| | | return cached.PR_nodes, cached.BA_nodes, cached.RE_nodes |
| | | end |
| | | local i = 1 |
| | | local PR_nodes = {} |
| | | local BA_nodes = {} |
| | | local RE_nodes = {} |
| | | local SP_nodes = {} |
| | | local all_nodes = {pos1} |
| | | repeat |
| | | traverse_network(PR_nodes, RE_nodes, BA_nodes, SP_nodes, all_nodes, |
| | | i, technic.machines[tier], tier, sw_pos) |
| | | i = i + 1 |
| | | until all_nodes[i] == nil |
| | | technic.networks[minetest.hash_node_position(pos1)] = {tier = tier, PR_nodes = PR_nodes, |
| | | RE_nodes = RE_nodes, BA_nodes = BA_nodes, SP_nodes = SP_nodes} |
| | | return PR_nodes, BA_nodes, RE_nodes |
| | | |
| | | local machines = technic.machines[tier] |
| | | local network = { |
| | | tier = tier, |
| | | PR_nodes = {}, |
| | | BA_nodes = {}, |
| | | RE_nodes = {}, |
| | | SP_nodes = {}, |
| | | all_nodes = {} |
| | | } |
| | | -- Traverse the network step by step starting from the node underneath the switching station |
| | | local queue = {} |
| | | add_cable_node(network.all_nodes, cable_pos, network_id, queue) |
| | | while next(queue) do |
| | | local to_visit = {} |
| | | for _, pos in ipairs(queue) do |
| | | traverse_network(network, pos, machines, sw_pos, network_id, to_visit) |
| | | end |
| | | queue = to_visit |
| | | end |
| | | |
| | | -- Convert { [hash] = pos, ... } to { pos, ... } |
| | | network.PR_nodes = flatten(network.PR_nodes) |
| | | network.BA_nodes = flatten(network.BA_nodes) |
| | | network.RE_nodes = flatten(network.RE_nodes) |
| | | network.SP_nodes = flatten(network.SP_nodes) |
| | | network.all_nodes = flatten(network.all_nodes) |
| | | technic.networks[network_id] = network |
| | | |
| | | return network.PR_nodes, network.BA_nodes, network.RE_nodes |
| | | end |
| | | |
| | | ----------------------------------------------- |
| | | -- The action code for the switching station -- |
| | | ----------------------------------------------- |
| | | |
| | | technic.powerctrl_state = true |
| | | |
| | | minetest.register_chatcommand("powerctrl", { |
| | | params = "[on/off]", |
| | | description = "Enables or disables technic's switching station ABM", |
| | | privs = { basic_privs = true }, |
| | | func = function(name, state) |
| | | technic.powerctrl_state = (state:trim():lower() == "on") |
| | | minetest.chat_send_player(name, "Technic switching station: " .. |
| | | (technic.powerctrl_state and "on" or "off")) |
| | | end |
| | | }) |
| | | |
| | | -- Run `technic_run` on all nodes in the power grid |
| | | local function run_nodes(list, run_stage) |
| | | for _, pos in ipairs(list) do |
| | | technic.get_or_load_node(pos) |
| | | local node = minetest.get_node_or_nil(pos) |
| | | if node and node.name then |
| | | local nodedef = minetest.registered_nodes[node.name] |
| | | if nodedef and nodedef.technic_run then |
| | | nodedef.technic_run(pos, node, run_stage) |
| | | end |
| | | end |
| | | end |
| | | end |
| | | |
| | | minetest.register_abm({ |
| | | nodenames = {"technic:switching_station"}, |
| | | label = "Switching Station", -- name for the Minetest mod profiler |
| | | interval = 1, |
| | | chance = 1, |
| | | action = function(pos, node, active_object_count, active_object_count_wider) |
| | | local meta = minetest.get_meta(pos) |
| | | local meta1 = nil |
| | | local pos1 = {} |
| | | local PR_EU = 0 -- EUs from PR nodes |
| | | local BA_PR_EU = 0 -- EUs from BA nodes (discharching) |
| | | local BA_RE_EU = 0 -- EUs to BA nodes (charging) |
| | | local RE_EU = 0 -- EUs to RE nodes |
| | | |
| | | local tier = "" |
| | | local PR_nodes |
| | | local BA_nodes |
| | | local RE_nodes |
| | | if not technic.powerctrl_state then return end |
| | | local meta = minetest.get_meta(pos) |
| | | local meta1 |
| | | local PR_nodes, BA_nodes, RE_nodes |
| | | local machine_name = S("Switching Station") |
| | | |
| | | -- Which kind of network are we on: |
| | | local cable_pos = {x=pos.x, y=pos.y-1, z=pos.z} |
| | | |
| | | --Disable if necessary |
| | | if meta:get_int("active") ~= 1 then |
| | | meta:set_int("active", 1) |
| | | local active_pos = minetest.deserialize(meta:get_string("active_pos")) |
| | | if active_pos then |
| | | local meta1 = minetest.get_meta(active_pos) |
| | | meta:set_string("infotext", S("%s (Slave)"):format(meta1:get_string("infotext"))) |
| | | minetest.forceload_free_block(pos) |
| | | minetest.forceload_free_block(cable_pos) |
| | | meta:set_string("infotext",S("%s Already Present"):format(machine_name)) |
| | | |
| | | local poshash = minetest.hash_node_position(pos) |
| | | |
| | | if not technic.redundant_warn[poshash] then |
| | | technic.redundant_warn[poshash] = true |
| | | print("[TECHNIC] Warning: redundant switching station found near "..minetest.pos_to_string(pos)) |
| | | end |
| | | return |
| | | end |
| | | |
| | | -- Which kind of network are we on: |
| | | pos1 = {x=pos.x, y=pos.y-1, z=pos.z} |
| | | |
| | | local name = minetest.get_node(pos1).name |
| | | local name = minetest.get_node(cable_pos).name |
| | | local tier = technic.get_cable_tier(name) |
| | | if tier then |
| | | PR_nodes, BA_nodes, RE_nodes = get_network(pos, pos1, tier) |
| | | -- Forceload switching station |
| | | minetest.forceload_block(pos) |
| | | minetest.forceload_block(cable_pos) |
| | | PR_nodes, BA_nodes, RE_nodes = get_network(pos, cable_pos, tier) |
| | | else |
| | | --dprint("Not connected to a network") |
| | | meta:set_string("infotext", S("%s Has No Network"):format(machine_name)) |
| | | minetest.forceload_free_block(pos) |
| | | minetest.forceload_free_block(cable_pos) |
| | | return |
| | | end |
| | | |
| | | -- Run all the nodes |
| | | local function run_nodes(list) |
| | | for _, pos2 in ipairs(list) do |
| | | technic.get_or_load_node(pos2) |
| | | local node2 = minetest.get_node(pos2) |
| | | local nodedef |
| | | if node2 and node2.name then |
| | | nodedef = minetest.registered_nodes[node2.name] |
| | | end |
| | | if nodedef and nodedef.technic_run then |
| | | nodedef.technic_run(pos2, node2) |
| | | end |
| | | end |
| | | end |
| | | |
| | | run_nodes(PR_nodes) |
| | | run_nodes(RE_nodes) |
| | | run_nodes(BA_nodes) |
| | | |
| | | run_nodes(PR_nodes, technic.producer) |
| | | run_nodes(RE_nodes, technic.receiver) |
| | | run_nodes(BA_nodes, technic.battery) |
| | | |
| | | -- Strings for the meta data |
| | | local eu_demand_str = tier.."_EU_demand" |
| | |
| | | end |
| | | --dprint("Total RE demand:"..RE_eu_demand) |
| | | |
| | | -- Get all the power from the BA nodes |
| | | local BA_eu_supply = 0 |
| | | -- Batteries |
| | | local BA_eu_supply, BA_eu_demand = 0, 0 |
| | | for _, pos1 in pairs(BA_nodes) do |
| | | meta1 = minetest.get_meta(pos1) |
| | | BA_eu_supply = BA_eu_supply + meta1:get_int(eu_supply_str) |
| | | end |
| | | --dprint("Total BA supply:"..BA_eu_supply) |
| | | |
| | | -- Get all the demand from the BA nodes |
| | | local BA_eu_demand = 0 |
| | | for _, pos1 in pairs(BA_nodes) do |
| | | meta1 = minetest.get_meta(pos1) |
| | | BA_eu_demand = BA_eu_demand + meta1:get_int(eu_demand_str) |
| | | end |
| | | --dprint("Total BA supply:"..BA_eu_supply) |
| | | --dprint("Total BA demand:"..BA_eu_demand) |
| | | |
| | | meta:set_string("infotext", |
| | | technic.format(S("%s. Supply: %e Demand: %e"), |
| | | machine_name, PR_eu_supply, RE_eu_demand)) |
| | | meta:set_string("infotext", S("@1. Supply: @2 Demand: @3", |
| | | machine_name, technic.EU_string(PR_eu_supply), |
| | | technic.EU_string(RE_eu_demand))) |
| | | |
| | | -- If mesecon signal and power supply or demand changed then |
| | | -- send them via digilines. |
| | | if mesecons_path and digilines_path and mesecon.is_powered(pos) then |
| | | if PR_eu_supply ~= meta:get_int("supply") or |
| | | RE_eu_demand ~= meta:get_int("demand") then |
| | | local channel = meta:get_string("channel") |
| | | digilines.receptor_send(pos, digilines.rules.default, channel, { |
| | | supply = PR_eu_supply, |
| | | demand = RE_eu_demand |
| | | }) |
| | | end |
| | | end |
| | | |
| | | -- Data that will be used by the power monitor |
| | | meta:set_int("supply", PR_eu_supply) |
| | | meta:set_int("demand", RE_eu_demand) |
| | | |
| | | -- If the PR supply is enough for the RE demand supply them all |
| | | if PR_eu_supply >= RE_eu_demand then |
| | |
| | | meta1 = minetest.get_meta(pos1) |
| | | meta1:set_int(eu_input_str, 0) |
| | | end |
| | | |
| | | end, |
| | | }) |
| | | |
| | |
| | | end |
| | | end |
| | | minetest.register_abm({ |
| | | label = "Machines: timeout check", |
| | | nodenames = {"group:technic_machine"}, |
| | | interval = 1, |
| | | chance = 1, |
| | |
| | | for tier, machines in pairs(technic.machines) do |
| | | if machines[node.name] and switching_station_timeout_count(pos, tier) then |
| | | local nodedef = minetest.registered_nodes[node.name] |
| | | if nodedef and nodedef.technic_disabled_machine_name then |
| | | node.name = nodedef.technic_disabled_machine_name |
| | | minetest.swap_node(pos, node) |
| | | elseif nodedef and nodedef.technic_on_disable then |
| | | nodedef.technic_on_disable(pos, node) |
| | | end |
| | | if nodedef then |
| | | local meta = minetest.get_meta(pos) |
| | | meta:set_string("infotext", S("%s Has No Network"):format(nodedef.description)) |
| | | end |
| | | if nodedef and nodedef.technic_disabled_machine_name then |
| | | node.name = nodedef.technic_disabled_machine_name |
| | | minetest.swap_node(pos, node) |
| | | end |
| | | if nodedef and nodedef.technic_on_disable then |
| | | nodedef.technic_on_disable(pos, node) |
| | | end |
| | | end |
| | | end |
| | | end, |
| | | }) |
| | | |
| | | --Re-enable disabled switching station if necessary, similar to the timeout above |
| | | minetest.register_abm({ |
| | | label = "Machines: re-enable check", |
| | | nodenames = {"technic:switching_station"}, |
| | | interval = 1, |
| | | chance = 1, |
| | | action = function(pos, node, active_object_count, active_object_count_wider) |
| | | local pos1 = {x=pos.x,y=pos.y-1,z=pos.z} |
| | | local tier = technic.get_cable_tier(minetest.get_node(pos1).name) |
| | | if not tier then return end |
| | | if switching_station_timeout_count(pos, tier) then |
| | | local meta = minetest.get_meta(pos) |
| | | meta:set_int("active",1) |
| | | end |
| | | end, |
| | | }) |
| | | |
| | | for tier, machines in pairs(technic.machines) do |
| | | -- SPECIAL will not be traversed |
| | | technic.register_machine(tier, "technic:switching_station", "SPECIAL") |