Introduction to the TBX DSS 16C22 module

General

The TBX DSS 16C22 is a modular base unit which has 16 transistor outputs 24 V DC 0.5 A. The module is equipped with a terminal for direct wiring of the sensors and preactuators, which can be removed when it is switched off.

The preactuator voltage is monitored to ensure coherent processing of the outputs during variations in the power supply.

The outputs are protected against overloads and short-circuits. If there is a fault at an output, it is set to a safe state, the default state, which is determined by the user: fallback position.

Once the fault has been corrected, the output can be reactivated, if it is reset.

The outputs of this base unit have functions which, in certain cases, are common to a group of channels. Thus, it is possible to assign the 2 channel groups of these base units to the various tasks in the application.

Specific function

The wiring check function for this module continually checks the quality of the connections to the preactuators.

Output wiring check faults enable diagnosis of a short-circuit or an open circuit depending on the channel state.

Technical specifications

The following table provides the technical specifications of the module.

TBX DSS 16C22
Nominal voltage +SV		24 V DC
Supply voltage +SV		19,2 V DC to 30 V DC
Current drawn on +SV of the base module (at 24 V)	if basic unit	30 mA typically
Current drawn on +SV of the base module (at 24 V)	if extension base unit	negligible
Current drawn at +SV by extension module (at 24 V)		25 mA typically
Current drawn at +OS (at 24 V) (with no active output)		35 mA typically
Power dissipated in the base unit (loading = 60 %)		4,3 W at 24 V
Dielectric strength between inputs and ground (GND)		1500 V rms - 50/60 Hz for 1 min
Isolation resistance		> 10 MΩ below 500 V DC

Key:
SV	Power supply to module (communication module if present and input interfaces).
OS	Power supply to pre‐actuators.