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APPX
Appendix 11 General Safety Requirements
245
A
Appendix 11
General Safety Requirements
When the power of a C Controller system is turned OFF and ON, the control output may not operate properly temporarily due
to differences in the delay and startup time between the power supply for the C Controller module and the external power
supply (especially, DC power) for the control module.
Signals also may not be output correctly when the external power supply or the C Controller module fails. In terms of fail-safe
and to prevent any incorrect output signals from leading to the entire system failure, configure safety circuits (such as
emergency stop circuits, protection circuits, and interlock circuits) external to the C Controller module for the parts where the
incorrect output may cause damage to the machines or accidents.
This section shows system design circuit examples, considering the points described above.
When the ERR. contact of a power supply module is not used
*1 The C Controller module starts when RA1 (control starting output) turns ON.
*2 A stop caused by an emergency stop switch or a limit switch.
*3 Configure external interlock circuits for conflicting operations such as forward/reverse rotations and the parts where the incorrect output
may cause damage to the machines or accidents.
MC
RA1
RA2
XM
Ym
Yn
MC2
MC1
MC
MC
MC
MC2
MC1
Ym
Yn
MC
RA1
MC
MC
RA2
L
MC1
RA1
MC2
MC1
MC2
L
RA1
MC
(-) (+)
For AC power
For AC and DC power
Power supply
Power supply
Transformer Transformer
Transformer
Fuse
Fuse
Fuse
C Controller module
C Controller module
DC power
Fuse
Start/Stop circuit*1
User program
Ò
User program
Ó
Start switch
Stop switch
Start switch
Input module
Stop switch
Low battery alarm
(Lamp or buzzer)
Output module
Use of a voltage relay is recommended.
Turns ON at the
start of C Controller
module user
program.
Low battery alarm
(Lamp or buzzer)
Output module
Output module
Turns ON at the start of C
Controller module user program.
Output module
Interlock circuits*3
Turns OFF the power
supplied to the output
modules by STOP*2.
Turns OFF the power supplied to
the output devices by STOP*2.
Summary of Contents for MELSEC iQ-R C R12CCPU-V
Page 1: ...MELSEC iQ R C Controller Module User s Manual Application R12CCPU V ...
Page 2: ......
Page 23: ...1 EXECUTING PROGRAMS 1 3 I O Access Timing 21 1 MEMO ...
Page 32: ...30 3 MEMORY CONFIGURATION OF C Controller Module 3 4 Files MEMO ...
Page 257: ...I 255 MEMO ...
Page 261: ......