Rockwell Automation 1747-L40 SLC 500 Fixed Hardware Style - Manual (Page 71)

Chapter 5
Wiring Your Control System
5–8
Removable Terminal Blocks (RTBs) are provided on all 12–point and
16–point discrete I/O modules and analog modules. RTBs can only be used
with these modules in the 2–slot expansion chassis. RTBs allow for faster
and more convenient wiring of the I/O modules. The modules and RTBs are
color–coded as follows:
Color Type of I/O Removable Terminal Block
Red AC inputs/outputs
Blue DC inputs/outputs
Orange relay outputs
Green specialty modules
Replacement terminal blocks are available if they are lost or damaged. See
the replacement part list in chapter 9.
Removing RTBs
Below are guidelines for removing the I/O RTBs.
!
ATTENTION: Never install or remove I/O modules or terminal
blocks while the SLC is powered.
1. If the I/O module is already installed in the chassis, remove power to the
SLC.
2. Unscrew the upper right and lower left terminal block release screws.
3. Grasp the RTB with your thumb and forefinger and pull straight out.
4. Label the RTB with appropriate slot, rack (chassis) and module
identification.
SLOT______RACK______
•
MODULE______
Dot indicates terminal number 0
(or top of I/O wiring).
Terminal Block Release Screw
Terminal Block Release Screw
Using Removable Terminal
Blocks (RTBs)