
SAFETY INSTRUCTIONS
Design Precautions
Install a safety circuit external to the PLC that keeps the entire system
safe even when there are problems with the external power supply or
the PLC module. Otherwise, serious trouble could result from
erroneous output or erroneous operation.
-
Outside the PLC, construct mechanical damage preventing interlock
circuits such as emergency stop, protective circuits, positioning upper
and lower limits switches and interlocking forward/reverse operation.
When the PLC detects the following problems, it will stop calculation and
turn off all output in the case of watchdog timer error, module interface
error, or other hardware errors.
However, one or more outputs could be turned on when there are
problems that the PLC CPU cannot detect, such as malfunction of output
device (relay, transistor, etc.) itself or I/O controller. Build a fail safe
circuit exterior to the PLC that will make sure the equipment operates
safely at such times. Also, build an external monitoring circuit that will
monitor any single outputs that could cause serious trouble.
Make sure all external load connected to output does NOT exceed the
rating of output module.
Overcurrent exceeding the rating of output module could cause fire, damage
or erroneous operation.
Build a circuit that turns on the external power supply when the PLC
main module power is turned on.
If the external power supply is turned on first, it could result in erroneous
output or erroneous operation.
Warning
Содержание MASTER-K 120S Series
Страница 26: ...Chapter 4 Names of Parts 4 3 2 K7M DRT60U 3 K7M DT60U 4 1 2 40 points main unit Standard 1 K7M DR40U ...
Страница 27: ...Chapter 4 Names of Parts 4 4 2 K7M DRT40U 3 K7M DT40U 4 1 3 30 points main unit Standard 1 K7M DR30U ...
Страница 28: ...Chapter 4 Names of Parts 4 5 2 K7M DRT30U 3 K7M DT30U 4 1 4 20 points main unit Standard 1 K7M DR20U ...
Страница 29: ...Chapter 4 Names of Parts 4 6 2 K7M DRT20U 3 K7M DT20U 4 1 5 30 points main unit Economic 1 K7M DR30UE ...
Страница 138: ...Chapter 7 Usage of Various Functions 7 54 c Program ...
Страница 306: ...Appendix 3 External Dimensions App3 2 2 Slim type G7E DC08A G7E RY08A G7F ADHB G7F DA2V G7F RD2A ...