Rockwell Automation 1746-NT8 SLC 500 Thermocouple/mV Analog Input Module User Manual - Manual (Page 80)

Publication 1746-UM022B-EN-P - January 2005
7-2 Maintaining Your Module And Safety Considerations
Stand Clear Of Machinery – When troubleshooting a problem with
any SLC 500 system, have all personnel remain clear of machinery.
The problem may be intermittent, and the machine may move
unexpectedly. Have someone ready to operate an emergency stop
switch.
Safety Circuits – Circuits installed on machinery for safety reasons
(like over-travel limit switches, stop push-buttons, and interlocks)
should always be hard-wired to the master control relay. These
circuits should also be wired in series so that when any one circuit
opens, the master control relay is de-energized, thereby removing
power.
Class 1, Division 2 - This equipment is suitable for use in Class 1,
Division 2, groups A, B, C, and D or non-hazardous locations only.
Refer to your system’s User Manual for more information.
ATTENTION
Possible Equipment Operation
Never reach into a machine to actuate a switch. Also,
remove all electrical power at the main power
disconnect switches before checking electrical
connections or inputs/outputs causing machine
motion.
Failure to observe these precautions can cause
personal injury or equipment damage.
ATTENTION
Explosion Hazard
Never modify these circuits to defeat their function.
Serious injury or equipment damage may result.
•
Substitution of components may impair suitability
for Class 1 Division 2.
•
Do not disconnect equipment unless power has
been switched off or the area is known to be
nonhazardous.
•
When in hazardous locations, turn off power
before replacing or wiring modules.