Spectrum Controls 1756sc-CTR8 - Manual (Page 18)

This equipment is classified as open equipment and must be installed
(mounted) in an enclosure during operation as a means of providing
safety protection.
CAUTION
POSSIBLE EQUIPMENT OPERATION
ATTENTION: The module is designed to support Removal and
Insertion Under Power (RIUP). However, when you remove or
insert an RTB with field-side power applied, unintended machine
motion or loss of process control can occur. Exercise extreme
caution when using this feature.
ATTENTION: Counter input isolated secondary circuits must be
energy limited and limited to not source more than 5.8 amp into
either the Counter inputs or the Gate inputs in the event of a
component failure
WARNING
The 1756sc-CTR8 module is to be used only with the Allen-Bradley
1756 ControlLogix System.
To insert your module into the rack, follow these steps:
1. Align the circuit board of your module with the card guides at the top
and bottom of the chassis.
Figure 2.1. Module insertion into a rack