135
Failsafe Circuits
Section 2-4
Failsafe Circuits
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. The CPU Unit uses an external output to activate
a dynamic brake and stop motion when it detects that the Error Counter
Warning Flag has turned ON.
The example shown below also shows handling an error occurring during
positioning. 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. The CPU Unit uses an external output to
send an emergency stop input to the MC Unit when it detects that the Error
Counter Warning Flag has turned ON.
In either of the above examples, the motor makes a sudden stop when an
error counter warning occurs. Make sure that this sudden stop will not result in
damage to the system.
Operation
command output
External
output
Error
counter
Ladder
program
execution
MC Unit
Voltage output
Servomotor
Amp
Error Counter Warning
Flag turned ON.
Error Counter Function
Selection Bit set to ON.
CPU Unit
Servo
driver
External output
Error
counter
Servo
driver
MC Unit
Emergency
stop input
Ladder
program
execution
Operation
command
output
Speed
reference
Error Counter Warning
Flag turned ON.
Error Counter Function
Selection Bit set to ON.
CPU Unit
Summary of Contents for CS1W-MC221 -
Page 1: ...Motion Control Units Cat No W359 E1 04 CS1W MC221 V1 421 V1 OPERATION MANUAL ...
Page 2: ...CS1W MC221 V1 421 V1 Motion Control Units Operation Manual Revised February 2008 ...
Page 3: ...iv ...
Page 5: ...vi ...
Page 11: ...xii ...
Page 15: ...xvi ...
Page 19: ...xx ...
Page 27: ...xxviii Conformance to EC Directives 6 ...
Page 133: ...106 Installation Section 2 2 2 2 4 Dimensions CS1W MC421 CS1W MC221 ...
Page 173: ...146 Connecting Peripheral Devices Section 2 7 ...
Page 227: ...200 Command Area Section 3 6 ...
Page 351: ...324 Interface Specifics Section 5 4 ...
Page 513: ...486 Absolute Encoder Interface Specifications Section 9 7 ...
Page 575: ...548 Error Log Section 12 6 ...
Page 589: ...562 Performance Appendix A ...
Page 655: ...628 Control Bit Flag Timing Charts Appendix E ...
Page 683: ...656 Origin Search Patterns Appendix F ...
Page 685: ...658 Encoder Divider Rate and Rotation Speed for OMRON Servo Drivers Appendix G ...