Run Output; Power Off Detection Delay Setting; Disabling Power Off Interrupts - Omron CS1G/H-CPUxx-EV1 Programming Manual

Startup Settings and Maintenance
6-6-3

RUN Output

!Caution If Output Unit's external power supply goes on before the PLC's power supply,
6-6-4

Power OFF Detection Delay Setting

6-6-5

Disabling Power OFF Interrupts

Some of the Power Supply Units (the C200HW-PA204R, C200HW-PA209R,
CJ1W-PA205R, and CS1D-PA207R) are equipped with a RUN output. This
output point is ON (closed) when the CPU Unit is operating in RUN or MONI-
TOR mode and OFF (open) when the CPU Unit is in PROGRAM mode.
This RUN output can be used to create an external safety circuits, such as an
emergency stop circuit that prevents an Output Unit's external power supply
from providing power unless the PLC is on.
Note When a Power Supply Unit without a RUN output is used, an equivalent out-
put can be created by programming the Always ON Flag (A1) as the execution
condition for an output point from an Output Unit.
the Output Unit may malfunction momentarily when the PLC first goes on. To
prevent any malfunction, add an external circuit that prevents the Output
Unit's external power supply from going on before the power supply to the
PLC itself. Create a fail-safe circuit like the one described above to ensure
that power is supplied by an external power supply only when the PLC is oper-
ating in RUN or MONITOR mode.
Normally a power interruption will be detected about 10 to 25 ms (2 to 5 ms
for DC power supplies) after the power supply voltage drops below 85% of the
minimum rated value(80% for DC power supplies). There is a setting in the
PLC Setup (address 225 bits 0 to 7, Power OFF Detection Delay Time) that
can extend this time by up to 10 ms (up to 2 ms for DC power supplies).
When the power OFF interrupt task is enabled, it will be executed when the
power interruption is confirmed, otherwise the CPU will be reset and operation
will be stopped.
Related Settings
Address Name
CIO 256, Power
bits 00 to OFF
07 Detection
Delay
This function is supported only by the CS1-H, CJ1-H, CJ1M, or CS1D CPU
Units.
With CS1-H, CJ1-H, CJ1M, or CS1D CPU Units, areas of the program can be
protected from power OFF interrupts so that they will be executed before the
CPU Unit even if the power supply is interrupted. This is achieved by using the
DISABLE
INTERRUPTS (DI(693)) and ENABLE INTERRUPTS (EI(694)) instructions.
Power Supply Unit
RUN output
Meaning
Set the time to 00 to 0A (Hex): 0 to 10 ms
delay before
detecting a
power interrup-
tion.
Section 6-6
Setting Default
00 (Hex):
0 ms
317