TBX IP20 module power supplies

General

Distributed I/O modules require a direct power supply via a 24 V voltage source (or 48 V for certain modular s). In order to best overcome the various constraints linked to the power sources, modules have separate power inputs to supply the:

communication circuits and I/O interface (module power supply),
the sensors,
the preactuators.

NOTE: the advantage of using separate external power supplies is that it is possible to cut the input or output supply without cutting the supply to the communication module.

Power supplies

The following table shows the number of separate power supplies available by I/O type.

Type of module	Number of separate power supplies
Discrete inputs	2	module power supply
Discrete inputs	2	input power supply
Transistor outputs	2	module power supply
Transistor outputs	2	output power supply
Discrete inputs and transistor outputs	3	module power supply
		input power supply
		output power supply
Discrete inputs and programmable I/O	2	module power supply
Discrete inputs and programmable I/O	2	input and programmable I/O power supply
Relay outputs	1	module power supply
Discrete inputs and relay outputs	2	module power supply
Discrete inputs and relay outputs	2	input power supply

NOTE: relay outputs are powered by the +-SV module supply.

The 0 of the external power supplies (-SV, -IS, -OS, -S) must be common.