ABB System 800xA Operations page 24

Warnings
Installing the PM86x/TP830 Processor Unit in Single Configuration
For PM861/PM864/PM865/PM866/PM866A insert the RCU Link Termination
plug TB852, at the RCU Link connector. The termination plug must always be used
for M861/PM864/PM865/PM866/PM867 when running in single configuration.
When a redundant processor is running in a single configuration use the RCU Link
Cable TK851, if the RCU Link Termination plug TB852 is not available.
Unit to Baseplate Alpha Code Lock
The CI862 baseplate has no locking device. Insert only the CI862 unit into this
baseplate. Insertion of other unit types may cause damage to the equipment.
Maintenance
Before attempting maintenance or troubleshooting, read the Safety Summary on
page 13. Failure to do so could lead to personal injury or damage to equipment.
Online Replacement of Unit
It is not allowed to manipulate CEX bus baseplates in a powered and running
system. Before changing or removing a baseplate, all CEX modules on that segment
must be removed.
Hazardous Location Approval
Explosion hazard - Substitution of components may impair suitability for Class I,
Zone 2.
Explosion hazard - Do not replace batteries unless the power has been switched off
or the area is known to be non-hazardous.
Explosion hazard - Do not disconnect equipment unless the power has been
switched off or the area is known to be non-hazardous.
24 2PAA110888-600 - Warnings based on 3BNP004865-600 RevA
Section 1 Safety Operator Warnings