The 23BA20 board has sixteen output relays. Two groups of eight contacts have the same common return. This allows to split the output channels only to two different process voltage sources.
The I/O micro controller (EAP Ein- AusgabeProzessor / Input- output processor) activates any
output forced by the VAP of CMU (CMU = communication unit) by a command output request.
The EAP controls the time duration of a pulse output by the loaded pulse length time value.
Output monitoring and supervision Any output is checked and monitored by the EAP by different tests and supervision functions:
• the output pattern is read back before the output is activated
• the 24 V DC from backplane bus to switch the output relays is supervised during an active output
• the pulse duration is controlled by the EAP
• any detected error is indicated by LEDs.
There are no settings required and possible on the 23BA20 board.
The board monitors and checks its functionality as well as the dialog via the peripheral bus. Detected errors are indicated and/or transmitted by the board:
• by the red LED ”ST” on the front plate
• by the red LED ”PST” on the front plate
• by diagnostic messages
LED “ST”
The “ST” LED indicates board errors or peripheral
bus errors.
The “ST”-LED indicates:
• board runs initialization procedure
• board is doing a cold- or warm start
• board has detected a memory error (RAM
or EPROM)
• micro controller faulty
• no dialog via the peripheral bus for at least 2 minutes. The board is not polled by the PBP of CMU.
LED “ST”
The LED indicates an error at command output:
• 24 V DC for the output relays failed during
command output
• Time out PBP during active output. Any
active output is stopped (switched off).
LED “CO”
At least one output relay is switched on. The “CO” LED is direct connected to the 24 VDC. CO”is ON for the time an output is active (pulse or persistent).
