Control

sensor and control are a pair: the first reads a block’s property, the second changes it. Almost everything can be read, and exactly five things can be changed:

Property	What it does	For whom
enabled	switches a block on and off	anyone
config	changes the setting — an item, a unit type	those configured with content
shoot	shoot at a point	turrets
shootp	shoot at a unit with lead	turrets
color	the glow colour	the illuminator

Nothing else about a block can be changed: not its stock, not its rotation, not its health. Logic can start and stop things, not build and break them.

Silent failure

Only linked blocks can be commanded. control checks the link to the processor, and a building obtained around it — by radar, out of a memory cell, from a neighbouring processor — will not carry out the order. No error, no trace: the line simply does nothing.

sensor meanwhile works with anyone. You may ask anybody; you may order only your own.

Lessons

1. Switching on and offThe one command that works on any block: switch it off and switch it back on
2. Configuring a blockA sorter, an unloader and a factory are configured with an item — and logic can change that setting on the fly
3. ShootingA turret shoots well enough on its own. Logic is for when it matters who exactly it shoots

What you need first

«Links and getlink» — how a processor reaches a block at all, and «Properties of buildings» — what a block can be asked.