Hardware Manual PCD 1 / PCD 2 Series│Document 26 / 737│Edition EN 15│2008-07-22
Saia-Burgess Controls AG
Presence/voltage monitoring for expansion unit
CPUs and expansion housings
3
3.24 Presence/voltage monitoring for expansion unit (PCD2 only)
With all PCD2s except the PCD2.M110, it is possible to detect the presence of
an expansion unit.
In conjunction with PCD3.C200 Modules it is also possible to recognize whether the
closest C200 to the CPU is connected to the supply.
A jumper can be used to configure whether the monitoring is activated.
Position Behaviour
XOB 1
ENABLE
Monitoring is switched on. In the following cases, XOB 1 is called:
no expansion unit is connected at start-up
at start-up, one of the PCD3.C200 units in the system is not on
during operation, the connection to the expansion unit(s) is lost
during operation, the supply to one of the PCD3.C200 units in the
system fails
not XOB 1
ENABLE
Monitoring is switched off (factory setting)
i
The code in XOB 1 defines how the unit should react to the event. If it is called from
the monitoring function, but has not been programmed, an entry will be written to
history and the Error LED will be set.