Transistor output simulators for discrete TBX (IP20) modules

General

It is connected on 8 0.5 A transformer outputs of a IP20 module, and enables the following to be simulated:

either a short-circuit
or the presence of a load (for modules with a wiring check function).

The red LEDs indicate the state of the outputs when simulating the presence of loads.

Connection

The transistor output simulator is fixed directly on the screw terminal of the TBX module (terminals O0 to O7, O8 to O15 or I/O8 to I/O15). The common wire (white) must be connected to a -Cs, -Csm,n+1 or -C (0V) terminal.

To simulate all the TBX module outputs (O0 to O15), two transistor output simulators are required:

one simulator connected at O0 to O7,
and the second connected at O8 to O15.

NOTE: For TBX mixed modules, the transistor output simulator is used with an input simulator.

Illustration

The following diagram shows the switches that can be used with transistor output simulators.

Description: SW2 in upper position

SW2 in upper position: no simulation of load present.

SW1 in upper position: output is not loaded:
- the LED is off
- if the module has an input wiring check function, this indicates a fault.
SW1 in lower position: there is a short-circuit on the output:
- if the output is at "1", the LED is off and a short-circuit fault is signaled
- if the output is at "0", the LED is off. If the module has an output wiring check function, no "wiring check" fault is signaled.

Description: SW2 in lower position

SW2 in lower position: simulation of load present.

SW1 in upper position: output is loaded and these is no short-circuit:
- if the output is at "0" and if the module has an output wiring check function, the LED is on but only faintly. No wiring check fault is signaled.
- if the output is at "0" and if the module does not have an output wiring check function , the LED is off.
- if the output is at "1" the LED is on.
SW1 in lower position: there is a short-circuit on the output:
- if the output is at "1", the LED is off and a "short-circuit" fault is signaled
- if the output is at "0", the LED is off. If the module has an output wiring check function, no "wiring check" fault is signaled.