Specifications

Theory of Operation
28
31007715 6/2008
Basic
PDM Power
Distribution
If your island uses basic PDMs instead of standard PDMs, then actuator power and
sensor power are sent over a single power line:
Each basic PDM contains on 5 A time-lag fuse that protects the I/O modules in the
segment. This fuse is user-replaceable.
PE Grounding A captive screw terminal on the bottom of the PDM base makes contact with pin 12
(see p. 34) on each I/O base, establishing an island PE bus. The screw terminal on
the PDM base meets IEC-1131 requirements for field power protection. The screw
terminal should be wired to the PE point on your system.
115 V
DAI
PDM
DAI DAI
DAO
DAO DAO
NIM
DDI DDO
24 V
PDM
1
2
24 V
DDI
Sensor Power
Actuator Power
PDM
DDI DDI
DDO
DDO DDO
NIM
AVI AVO ACI ACO
PE Bus
To PE point on system
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