Spectrum Controls 1746sc-NI8u User Manual
Page 15
Chapter 1: Module Overview
3
All eight input channels are individually configurable for thermocouple,
millivolt, volt, or milliamp input types. Channels 4 through 7 can be defined
for RTD or resistance inputs, and then can be individually configured for a
specific RTD or resistance type. Each input channel provides broken
input, over-range, and under-range detection and indication, when enabled.
Hardware Features
The module fits into any single slot for I/O modules in either an SLC 500
modular system or an SLC 500 fixed system expansion chassis (1746-A2).
It is a Class 1
1
module (uses 8 input words and 8 output words).
1
Requires use of Block Transfer in a remote configuration.
The module utilizes two removable terminal blocks, that provides
connections for the eight input channels. There are two cold-junction
compensation (CJC) sensors that compensate for the cold junction at
ambient temperature rather than at freezing (0°C). There are four current
sources for supplying the RTD or resistance sensors. The module is
configured through software, with jumpers used to define RTD,
resistance, current or voltage input paths.
Table 1.6 Hardware Features
Hardware
Function
Channel Status LED Indicators
Display operating and fault status of channels 0-7
Module Status LED
Displays operating and fault status of the module
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
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 channel diagnostics are explained in Chapter 6, Testing
Your Module.
System Overview
The module communicates with the SLC 500 processor and receives
+5 Vdc and +24 Vdc power from the system power supply through
the parallel backplane interface. No external power supply is
required. You may install as many universal modules in the system
as the power supply can support.