Omron CS1W-MC221 - 02-2008 Operation Manual page 163

Failsafe Circuits
Stopping the Motor with an Error Counter Overflow
Error Counter Overflows
Failsafe Circuits
CPU Unit
Ladder
program
execution
Speed reference voltage
Operation command output
136
When the error counter overflows, a speed reference voltage of 0 V will be
output to the Servo Driver for 0.5 s and then the operation command output to
the Servo Driver will be turned OFF.
The value of the error counter at which an overflow occurs can be controlled
using the Error Counter Function Selection Bit. The following settings are pos-
sible.
ON: An overflow will occur at 65,535.
When the Selection Bit is ON, the Error Counter Warning Flag can
also be used.
OFF: An overflow will occur at the value set for the error counter warning.
When the Selection Bit is ON, the Error Counter Warning Flag thus
cannot be used.
Refer to Error Counter Function Selection Bit in 5-4-1 System Controls for
more information.
The example shown below shows handling an error occurring during position-
ing. The MC Unit checks the error counter, and the Error Counter Warning
Flag in the PLC Interface Area is turned ON whenever the Error Counter
Warning Value is exceeded.
Error Counter Function
Selection Bit set to OFF.
MC Unit
Operation
command output
Error
counter
Voltage output
0 V
0.5 s
OFF
Section 2-4
Servomotor
Servo
driver