Safety Circuit - Toshiba NV Series Hardware Manual

Chapter 4 Start and Stop
4.1

Safety Circuit

"Contacts open when power supply stops or power line is broken". This is one of the
fundamental characteristics of relays in the normal relay sequence. Based on this concept,
the T series migration system for type1 light controller module PUM12 is made failsafe so
that all outputs are turned off in the event of emergency stop, power failure, or error
shutdown.
However, it is not the best way to include all functions in the program of type1 light
controller, considering such a case that the CPU or I/O module fails or the I/O cable is
broken.
Configure the following safety circuits outside the type1 light controller with full
consideration of the failure of type1 light controller and breaks of wiring.
For details, refer to "Unified controller nv series type1 light Controller Unit User's Manual -
Basic Hardware -" (6F8C1497).
104
6F8C1497
(1) Emergency stop circuit
(2) Safety interlocking circuit (forward and reverse, etc.)
Configure the emergency stop circuit and the interlock
Danger
circuit outside the type1 light controller
If a failure or malfunction occurs in the type1 light controller, it may
result in serious accidents. There is also the risk of damage to the
equipment.
Instruction