Installation 2
2 - 15
Module Wiring
Analog Inputs:
Modules should NEVER be installed or removed while power is applied to the
I/O PLEXER.
Note: Analog modules normally run hot to the touch
Correct polarity connections are essential to proper operation of all analog inputs.
Connections to terminals marked with a “+” must be more positive than the
terminals marked with a “-“. Thermocouples and RTD’s are connected directly to
the I/O modules with special connectors which insure correct polarity.
Module status indicators are On dimly, when wired correctly, and monitoring a
valid signal. The indicator light may be On brightly, off, or flicker otherwise.
Figure 2-16, figure 2-17 and figure 2-18 show the wiring for various types of
analog inputs. With the exception of thermocouples and RTD’s, connections are
made via the black terminal strip. In the case of thermocouple RTD’s,
connections are made directly to the module, mating connectors are included.
There must be nothing connected to the screw terminals corresponding to these
module positions. The source of analog inputs is external to the I/O PLEXER in
most circumstances. Exceptions are those of RTD and Type 590 temperature
input modules where source excitation is supplied within the module
.
Figure 2-16 AC current and voltage wiring
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