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4. SAFETY OBSERVATION FUNCTION
4.5.7 Status monitor (SM) function
Each function state of SSM, SBC, STO, SOS, SS1, SS2, and SLS will be outputted by signals. This function
is not the one defined in IEC/EN 61800-5-2. The function is an original function of the functional safety unit.
For details of device, refer to section 3.6.2.
4.5.8 Multiple inputs of safety observation functional operation commands
Operation commands which have the same function can be input simultaneously for operation commands of
the safety observation function. For example, SS1C (SS1 command) input and SS1 input due to an alarm
occurrence can occur simultaneously.
When there are multiple operation triggers for a function and at least one of them is valid, the function will
start. The following shows an operation sequence for when an alarm occurs during the operation of SS1 by
SS1C (SS1 command) as an example.
Servo motor speed
SS1C
(SS1 command)
ALM (Malfunction)
Operation of SS1
STOS
(STO output)
As triggers of the SS1 function, SS1C (SS1 command) and ALM (Malfunction) are input. However, a timer
counting the SS1/SS2 monitoring deceleration time is the only one counting from SS1C (SS1 command)
which was started first. At the moment of SS1C (SS1 command) returning to on, the SS1 function is being
enabled by ALM (Malfunction), thus, the SS1 function continues the operation.
Ordinary
operation
0 r/min
ON (disabled)
OFF (enabled)
ON (no alarm)
OFF (alarm)
isabled
enabled
ON (disabled)
OFF (enabled)
4 - 36
SS1 in progress
SS1 operation time
STO status
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