Instruction manual

49
Alarm indicator and Alarm output
For A2 output, use terminals 12 and 13.
A1 and A2 indicators light when their terminals are connected, and go off when
their terminals are disconnected.
When Alarm 1 (A1) De-energized or Alarm 2 (A2) De-energized is selected during
Alarm 1 (A1) or Alarm 2 (A2) Energized/De-energized selection, the alarm output
ON/OFF status acts in reverse. In this case, A1 and A2 indicators light when their
terminals are disconnected, and go off when their terminals are connected.
Alarm action in overscale and underscale
During overscale, High limit alarm, High/Low limits alarm and Process high alarm
are activated.
During underscale, Low limit alarm, High/Low limits alarm and Process low alarm
are activated.
For the alarm with standby function, the standby function is released.
9. Other functions
Power failure countermeasure
The setting data is backed up in the non-volatile IC memory.
If power failure occurs during the program control run, and if the power is restored,
the program control resumes from the point at which power failure occurred.
If power failure occurs during the fixed value control, and if the power is restored,
the fixed value control resumes.
Self-diagnosis
The CPU is monitored by a watchdog timer, and if an abnormal status is found on
the CPU, the controller is switched to warm-up status.
OFF
ON
High/Low limits alarm with standby
SV
A1
value
A1
value
Alarm action
Alarm output
A1 hysteresis
:
A1 output terminals 7 and 8 are connected (ON).
: Standby functions.
:
:
A1 output terminals 7 and 8 are disconnected (OFF).
A1 output terminals 7 and 8 are connected (ON) or disconnected (OFF).