xvii
Safety Precautions 3
• The PC will turn OFF all outputs when its self-diagnosis function detects
any error or when a severe failure alarm (FALS) instruction is executed.
As a countermeasure for such errors, external safety measures must be
provided to ensure safety in the system.
• The PC outputs may remain ON or OFF due to deposition or burning of
the output relays or destruction of the output transistors. As a counter-
measure for such problems, external safety measures must be provided
to ensure safety in the system.
• If the 24-VDC output (service power supply) of the Power Supply Unit
(CPM2C-PA201) is overloaded or shorted, the voltage may drop causing
outputs to turn OFF. External safety measures must be provided to
ensure safety in the system in such an event.
!WARNING When handling the Memory Backup Battery, never drop, disassemble, distort,
short-circuit, recharge, heat to a temperature exceeding 100
°C, or throw into
fire. Otherwise the Battery may explode, catch fire, or leak fluid.
!WARNING When transferring programs to other nodes, or when making changes to I/O
memory, confirm the safety of the destination node before transfer. Not doing
so may result in injury.
!Caution Execute online edit only after confirming that no adverse effects will be
caused by extending the cycle time. Otherwise, the input signals may not be
readable.
!Caution Tighten the screws on the terminal block of the Power Supply Unit (CPM2C-
PA201) to a torque of 0.74 to 0.9 N•m. Loose screws may result in burning or
malfunction.
!Caution Do not connect the 24-VDC output (service power supply) or the Power Sup-
ply Unit (CPM2C-PA201) to an AC power supply. Connecting it to an AC
power supply will damage the internal circuit.
!Caution When connecting a personal computer or other peripheral device to the
CPM2C, either ground the 0 V side of the CPM2C or do not ground at all.
Depending on the method of grounding, the 24-V power supply may short-cir-
cuit; do not ground the 24-V side as shown in the following diagram.
Example: Connections where 24-V Power Supply Will Short-circuit
CPM2C Peripheral device
24 V
FG FG
0 V 0 V
0 V
Non-isolated DC
power supply
To Next Page
Loading...
