Allen Bradley SLC 500 1746-NT4 PLC Input module

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Brand Name                 AB

Product reference      1746-NT4

The Allen-Bradley 1746-NT4 is a SLC 500 Thermocouple/mV Analog Input Module. This Thermocouple/mV Analog Input Module has 4 Inputs and a Backplane Current (5 Volts) of 60 milliamps.

The Allen Bradley 1746-NT4 is a Thermocouple/mV Input Module for an SLC 500 system. It provides all SLC 500 processors with digitally converted thermocouple or millivolt (mV) analog data, received and stored in its image table. It does not require any external power supply as it receives 5 Volts DC and 24 Volts DC power from the SLC 500 power supply through its backplane. It has two cold-junction compensation (CJC) sensors instead of offset voltages to retain thermocouple input signal accuracy. Block transfers are required by this module in a remote I/O configuration. It interfaces to thermocouple types J, K, T, E, R, S, B, and N, and accepts direct ±50 mV and ±100 mV analog input signals.

The 1746-NT4 module has 4 backplane isolated input channels. It has a backplane current consumption of 60 mA at 5 Volts DC and 40 mA at 24 Volts DC. It has backplane power consumption of 0.3 Watts at 5 Volts DC and 0.5 Watts at 2 Volts DC, a 16-bit converter resolution, and a 12 to 300 millisecond Step response at 95%. It has a bandwidth of 2.62 - 65.5 Hertz and a 26 millisecond - 1.2 second update period and uses sigma-delta modulation for A/D conversion. It can be installed in any slot except slot 0 of the SLC 500 chassis. It uses two wires per terminal with a maximum wire size of 2.5 millimeters (14 AWG) and 25 Ω maximum cable impedance. For Thermocouple inputs, use shielded twisted thermocouple extension wire; for mV inputs, Belden 8761 or equivalent wire must be used.

The 1746-NT4 module auto calibrates at power-up and whenever a channel is enabled. It has 5 green LED status indicators, one for module status and one for each of the four channels.

Technical specifications:

Hardware Features The thermocouple module fits into any single-slot, except the processor slot (0), in either an SLC 500 modular system or an SLC 500 fixed system expansion chassis (1746-A2). It is a Class 1 module (uses 8 input words and 8 output words). It interfaces to thermocouple types J, K, T, E, R, S, B, and N, and supports direct ±50 mV and ±100 mV analog input signals. The module requires the use of Block Transfer in a remote configuration. The module contains a removable terminal block providing connection for four thermocouple and/or analog input devices. There are also two, cold-junction compensation (CJC) sensors used to compensate for offset voltages introduced into the input signal as a result of the cold-junction, i.e., where the thermocouple wires connect to the module wiring terminal. There are no output channels on the module. Module configuration is done via the user program. There are no DIP switches.

General Diagnostic Features The thermocouple/mV module contains diagnostic features that can help you identify the source of problems that may occur during power-up or during normal channel operation. These power-up and channel diagnostics are explained in chapter 7, Module Diagnostics and Troubleshooting. System Overview The thermocouple module communicates to the SLC 500 processor through the parallel backplane interface and receives +5V dc and +24V dc power from the SLC 500 power supply through the backplane. No external power supply is required. You may install as many thermocouple modules in your system as the power supply can support.

Each individual channel on the thermocouple module can receive input signals from thermocouple sensors or mV analog input devices. You configure each channel to accept either input. When configured for thermocouple input types, the thermocouple module converts the analog input voltages into cold-junction compensated and linearized, digital temperature readings. The 1746-NT4 uses the National Bureau of Standards (NBS) Monograph 125 and 161 based on IPTS-68 for thermocouple linearization. When configured for millivolt analog inputs, the module converts the analog values directly into digital values. The module assumes that the mV input signal is already linear. System Operation At power-up, the thermocouple module performs a check of its internal circuits, memory, and basic functions. During this time the module status LED remains off. If no faults are found during the power-up diagnostics, the module status LED is turned on.

After power-up checks are complete, the thermocouple module waits for valid channel configuration data from your SLC ladder logic program (channel status LEDs off). After configuration data is written to one or more channel configuration words and their channel enable status bits are set, the channel status LEDs go on and the thermocouple module continuously converts the thermocouple or millivolt input to a value within the range you selected for the enabled channels. Each time a channel is read by the module, that data value is tested by the module for a fault condition, i.e. open circuit, over range, and under range. If such a condition is detected, a unique bit is set in the channel status word and the channel status LED blinks. The SLC processor reads the converted thermocouple or millivolt data from the module at the end of the program scan, or when commanded by the ladder program. The processor and thermocouple module determine that the backplane data transfer was made without error, and the data is used in your ladder program.

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