Siemens PSU8600 Manual page 43

SITOP BUF8600 buffer modules with electrolytic capacitors in the system are not taken into
account.
Signaling contact
13-14 open
(quiescent state)
13-14 closed
The signaling contact "Buffer mode" OK is in the form of a relay contact (NO contact,
terminals "23" and "24") and signals that the system is in buffer mode. This means that
critical processes can be immediately brought into a safe state, avoiding loss of data and
additional damage.
For two SITOP BUF8600 buffer modules with double-layer capacitors in the system, both
modules simultaneously signal buffer mode using the signaling contact. As a consequence, it
is sufficient to wire one of the two contacts. The signal "Buffer mode" refers exclusively to the
SITOP BUF8600 buffer modules with double-layer capacitors in the system.
SITOP BUF8600 buffer modules with electrolytic capacitors in the system are not taken into
account.
Signaling contact
23-24 open
(quiescent state)
23-24 closed
Power supply system PSU8600
Manual, 05.2017, A5E36758446-3-76
Description, device design, dimension drawing
Explanation
Charge state of the buffer module or two buffer modules < x % - or
module fault
Charge state of the buffer module or two buffer modules ≥ x %
Explanation
Power failure, system is buffered by the buffer module.
Normal operation, buffer module is charged (if required).
2.7 Signaling contact/control contact
43