Rockwell Automation 1769-IG16 Compact TTL Input Module - Manual (Page 7)

Compact TTL Input Module 7
Publication 1769-IN079A-EN-P - May 2006
6. To allow communication between the controller and module, move the bus
lever fully to the left (4) until it clicks, making sure it is locked firmly in
place.
7. Attach an end-cap terminator (5) to the last module in the system by using
the tongue-and-groove slots as before.
8. Lock the end-cap bus terminator (6).
Replace a Single Module Within a System
The module can be replaced while the system is mounted to a panel (or DIN rail).
1. Remove power.
Refer to Remove Power on page 3.
2. Remove the upper and lower mounting screws from the module (or open
the DIN latches using a flat-blade or Phillips-style 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 is disconnected from
the bus and that both mounting screws are removed (or DIN latches
opened).
ATTENTION
When attaching I/O modules, it is very important that the bus
connectors are securely locked together to be sure of proper
electrical connection.
IMPORTANT
You must use a 1769-ECR or 1769-ECL right or left end cap to
terminate the end of the serial communication bus.
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.