6. CONNECTION OF I/O UNITS TO
Turning the DO (output signal) power on and off (DOCOM)
All the DO signals can be turned off simultaneously by turning off
(opening) the DO (output signal) power supply pin “DOCOM”. Doing
so causes the DO signal status to change as shown below.
When DO is ON in the sequence
When DO is OFF in the sequence
1 When the DO signal is in the ON state in the sequence, the
ON or OFF state of the DOCOM pin determines the state of
the signal, as shown within dotted lines in the above figure.
2 Do not turn off the +24 V supply provided by the CPD1 to the
I/O module during the operation. Turning off the +24 V
supply causes a Power Mate communication alarm. When
turning on the power, the +24 V supply to the I/O module
must be turned on before or at the same time as the power
supply to the Power Mate. When turning off the power, the
+24 V supply to the I/O module must be turned off after or
at the same time as the power supply to the Power Mate.