Spectrum Controls 1756sc-IF8u - Manual (Page 16)

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ControlLogix ™ Counter Module
Table 1.6 Hardware Features
Hardware Function
OK LED Displays communication and fault status of the module
Cal LED Displays a fault condition
Side Label (Nameplate) Provides module information
Removable Terminal Block Provides electrical connection to input devices
Door Label Permits easy terminal identification
Self Locking Tabs Secure module in chassis slot
Terminal Block Switch Locks the RTB to the module.
Diagnostic LEDs
The module contains diagnostic LEDs that help you identify the source of
problems that may occur during power-up or during normal operation.
Power-up and diagnostics are explained in Chapter 7, Testing Your
Module.
System Overview
The module communicates with the ControlLogix processor and receives
+5 Vdc and +24 Vdc power from the system power supply through the
parallel backplane interface. You may install as many universal modules in
the system as the power supply can support. Channels (0 through 7) can
receive input signals from RTDs, resistance sources, thermocouples,
millivolt, volt, or milliamp devices. When configured for thermocouple input
types, the module converts analog input voltages into cold-junction
compensated and linearized, digital temperature readings. The module uses
the National Institute of Standards and Technology (NIST) linearization
tables based on ITS-90 for thermocouple linearization.
When configured for RTD input types, the module converts the analog
input voltages into digital temperature readings, based on the alpha type,
wire type, and ohms specified. The standards used are the JIS C 1604-
1997 for the Pt 385 RTD types, the JIS C 1604-1989 for the Pt 3916 RTD
types, SAMA RC21-4-1966 for the 10. Cu 426 RTD, DIN 43760 Sept.
1987 for the 120. Ni 618 RTD, and MINCO Application Aid #18 May
1990 for the 120. Ni 672 RTD.When configured for millivolt, volt, milliamp,
or resistance analog inputs, the module converts the analog values directly
into floating point values. For those input types, the module assumes that
the input signal is linear prior to input into the module.