ROC800-Series Instruction Manual
4-28 Input/Output Modules Revised July-2017
Note: If the label on your AC I/O module does not indicate 120/240V,
your module is designed for use only with 120V. Additionally,
all AC wiring must be shielded.
Table 4-5. Field Wiring Terminals
AC Input (Permissive Power)
The field terminal wiring has the following definitions:
The AC power applied to this terminal is the source for
any channel that is configured as an output. The input to
this terminal should be externally fused with a 10 to 15
amp fuse. The channel has a green LED associated with it
to indicate when power is applied. This terminal is typically
wired to the permissive/safety circuitry so that if this circuit
trips, all power is removed from the channels that are
configured as AC outputs.
This terminal is connected to the system AC neutral and is
used a reference for all AC power.
Depending upon the configuration of the DIP switch, each
channel can be configured as an input or an output.
4.13 Thermocouple (TC) Input Module
The TC2 module is NOT supported in the Series 1 CPU.
The four-channel Thermocouple Input module monitors types B, C, E,
J, K, N, R, S, or T thermocouples, based on how you configure the
module with ROCLINK 800 Configuration software. The type of
thermocouple refers to the material used to make a bimetallic junction.
Dissimilar materials in the junction generate different millivolt levels as
a function of the heat to which the materials are exposed.
The Thermocouple module measures the voltage of the thermocouple to
which it is connected. The TC voltage is measured and a Cold Junction
Compensation (CJC) correction factor is applied to compensate for
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