Siemens SIMATIC S7 F Manual page 261

Fail-Safe Blocks
Name
SHUTDOWN
RQ_FULL
F_PRG_SIG
ALARM_EN
Outputs: FULL_SD
EN_INIT
SAFE_M
MSG_ERR
MSG_STAT
MSG_ACK
NFY_DONE
NFY_ERR
Fail-Safe Systems
A5E00085588-03
Data Type Explanation
BOOL Defines the response to a
detected FAILURE (rising
edge). Either a "Partial
(isolated F Run-time groups
shutdown) or "Full (entire
Safety Program shutdown).
BOOL Manual request for entire
Safety Program shutdown. A
rising edge will force a full
shutdown. User may connect
external logic to this input.
DWORD Safety Program Overall
Signature (created during
compile only – not updated
online)
BOOL Alarm messaging enabled
allows messages to be
reported to the HMI (WINCC).
The messages (incoming and
outgoing) reported are Full
Shutdown, Partial Shutdown,
Restart of Shutdown Logic,
and Safety Mode (enabled or
disabled).
BOOL Entire Safety Program
shutdown when TRUE.
Latched output resettable
through RESTART input.
BOOL Required for Safety Program
initialization logic.
Immediately following the
RESTART request, EN_INIT
will remain TRUE while the
function block initialization
logic executes.
BOOL Indication of the current
system mode of operation.
1=Safety Mode, 0=Test Mode.
This output may be connected
to external logic.
BOOL Return of SFB 34 ALARM_8
ERROR output.
WORD Return of SFB 34 ALARM_8
STATUS output.
WORD Return of SFB 34 ALARM_8
ACK output.
BOOL Return of SFB 31 NOTIFY_8P
DONE output.
BOOL Return of SFB 31 NOTIFY_8P
ERROR output.
Default
Full (1)
0
0
1
0
0
0
0
W#16#0000
W#16#0000
0
0
8-73