Rockwell Automation 1734D-1B8XOW8S 8 Input/8 Relay Output Module Installation Instructions - Manual (Page 7)

POINTBlock dc 8 Input/8 Relay Output Module 7
Publication 1734-IN021C-EN-P - September 2006
Install the Module
For information about how to install the module, read this and the
sections on how to set the node address and wire the module.
ATTENTION
This product is grounded through the DIN rail to chassis ground.
Use zinc-plated, yellow-chromated steel DIN rail to assure proper
grounding. Using other DIN rail materials, for example, aluminum
and plastic, which can corrode, oxidize or are poor conductors, can
result in improper or intermittent platform grounding.
Secure DIN rail to mounting surface approximately every 200 mm
(7.8 in.) and use end-anchors appropriately.
ATTENTION
Whatever field power you supply is connected to the internal
field-power bus. For example, if 120V ac is applied to the power
connections, 120V ac is applied to the modules through the
internal field-power bus.
POINT I/O modules to the right of the module also have that
internal power bus voltage applied, unless you use a 1734-FPD
module to interrupt and change the field power-bus voltage.