Rockwell Automation 1769-IT6 Compact I/O 1769-IT6 Thermocouple/mV Input Module - Manual (Page 30)

30 Rockwell Automation Publication 1769-UM004B-EN-P - March 2010
Chapter 3 Installation and Wiring
Replace a Single Module
within a System The module can be replaced while the system is mounted to a panel (or DIN
rail). Follow these steps in order.
1. Remove power.
See the important note on page 27 .
2. On the module to be removed, remove the upper and lower mounting
screws from the module (or open the DIN latches with screwdriver).
3. Move the bus lever to the right to disconnect (unlock) the bus.
4. On the right-side adjacent module, move its bus lever to the right (unlock)
to disconnect it from the module to be removed.
5. Gently slide the disconnected module forward.
If you feel excessive resistance, check that the module has been
disconnected from the bus, and that both mounting screws have been
removed (or DIN latches opened).
6. Before installing the replacement module, be sure that the bus lever on the
module to be installed and on the right-side adjacent module or end cap
are in the unlocked (fully right) position.
7. Slide the replacement module into the open slot.
8. Connect the modules together by locking (fully left) the bus levers on the
replacement module and the right-side adjacent module.
9. Replace the mounting screws (or snap the module onto the DIN rail).
Field Wiring Connections Use these guidelines when making field wiring connections.
System Wiring Guidelines
Consider these guidelines when wiring your system:
General Guidelines
• Power and input wiring must be in accordance with Class 1, Division 2
wiring methods, Article 501-4(b) of the National Electric Code,
NFPA 70, and in accordance with the authority having jurisdiction.
• Channels are isolated from one another by ±10V DC maximum.
• Route field wiring away from any other wiring and as far as possible from
sources of electrical noise, such as motors, transformers, contactors, and
AC devices. As a general rule, allow at least 15.2 cm (6 in.) of separation
for every 120V of power.
TIP It may be necessary to rock the module slightly from front to back
to remove it, or, in a panel-mounted system, to loosen the screws
of adjacent modules.