Siemens SITOP PSU8600 Manual page 60

Description, device design, dimension drawing
2.9 Signaling contacts/control contacts
SITOP BUF8600 buffer modules with electrolytic capacitors are not taken into account.
Signaling contact
13-14 open
(quiescent state)
13-14 closed
The signaling contact buffer mode "BUF" is in the form of a relay contact (NO contact,
terminals "23" and "24") and signals that the system is in the buffer mode. Critical processes
are immediately brought into a safe state. Loss of data and additional damage are
prevented.
For two buffer components (buffer module, UPS module) 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 and SITOP UPS8600 UPS
modules.
SITOP BUF8600 buffer modules with electrolytic capacitors are not taken into account.
Signaling contact
23-24 open
(quiescent state)
23-24 closed
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Explanation
Charge state of the buffer module or two buffer modules < x %
or
buffer mode with "ON" contact or remotely deactivated
Charge state of the buffer module or two buffer modules ≥ x %
Explanation
Normal operation.
Buffer module is charged (if required).
Power failure, buffer mode
System is buffered via the buffer component(s).
Power supply system SITOP PSU8600
Manual, 09.2018, A5E36758446-5-76