The 23BA20 board has sixteen output relays,Twogroups of eight contacts have the same common re-turn.
This allows to split the output channels only totwo different process voltage sources.
ProcessingfunctionThe I/O micro controller (EAP Ein-Ausgabe-Prozes-sor /Input- output processor) activates any outputforced by the VAP of CMU (CMU = communicationunit) by a command output request.
The EAP con-trols the time duration ofa pulse outputby the loadedpulse length time value.
OutputmonitoringandsupervisionAny output is checked and monitored by the EAP bydifferent tests and supervision functions:
---the outputpattern is read backbefore the outputis activated---the 24 V DC from backplane bus to switch theoutput relays is supervised during an active out-put---the pulse
duration is controlled by the EAP---any detected error is indicated by LEDs.
