Table of Contents
Advertisement
3.1
Before you begin
Safety instructions
For your safety and effective operation, read the safety instructions thoroughly before
using the product.
Safety instructions should always be observed in order to prevent accident or risk
•
with the safe and proper use of the product.
Instructions are separated into Warning and Caution.
•
Safety instructions when designing
WARNING
•
•
•
•
R200
Isolated Analog Output Module 2MLF-DV4S, 2MLF-DC4S User's Guide
September 2010
3. Installation and wiring
Install protection circuit on the exterior of the PLC to protect the whole
control system from any error in external power or PLC module. Any
abnormal output or operation may be a safety threat to the whole
system.
−
Install applicable protection unit on the exterior of PLC to protect the
system from physical damage such as emergent stop switch,
protection circuit, the upper/lower limit switch, forward/reverse
operation interlock circuit, and so on.
−
If any system error (watch-dog timer error, module installation error,
and, so on.) is detected during CPU operation in PLC, the whole
output is designed to be turned off and stopped for system safety.
However, in case CPU error is caused on output device itself such as
relay or TR cannot be detected, the output may be kept on, which
may cause serious problems. Thus, you are recommended to install
an additional circuit to monitor the output status.
Never connect the overload than rated to the output module nor allow the
output circuit to have a short circuit, which may cause a fire.
Never let the external power of the output circuit be designed to be on
earlier than PLC power, which may cause abnormal output or operation.
In case of data exchange between computer or other external equipment
and PLC through communication or any operation of PLC (For example,
operation mode change), install interlock in the sequence program to
protect the system from any error. If not, it may cause abnormal output or
operation.
Honeywell
43
Advertisement
Table of Contents
