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.