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1785-LT4

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The Allen-Bradley 1785-LT4 processor module is a PLC 5 series controller and processor module. Its user memory capacity is 6K words while its EEPROM module memory capacity is 8K words. The 1785-LT4 processor module supports 256 maximum analog I/O. Its rated programs scan times are 2 milliseconds per 1000 words for discrete logic and 8 milliseconds per 1000 words for typical programs. The 1785-LT4 processor module requires 2.5 Amps of backplane current at a voltage rating of 5 Volts DC.

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Technical specifications for 1785-LT4

Manufacturer	Rockwell Automation
Brand	Allen-Bradley
Part Number/Catalog No.	1785-LT4
Module Type	Processor
Backplane Requirement	2.5 Amperes at 5 Volts DC
Analog I/O	256
DH+ Channel	Yes
Remote I/O Channel	Yes
Number of Words	6 Kilowords SRAM
Max Analog I/O	3072
I/O Scan Time Per Rack	10 ms at 57.6 kbits/s, 7 ms at 115.2 kbits/s, 3 ms at 230.4 mbits/s
Max I/O Chassis Total	93
Max I/O Chassis Extended Local	0
Max I/O Chassis Universal Remote	32 Max. Per I/O Link
RS-232-C/422-A/423- A Ports	1
Control Coprocessor Expansion Port	Yes

Rockwell Disclaimer: The product is used surplus. DO Supply is not an authorized surplus dealer or affiliate for the Manufacturer of this product. The product may have older date codes or be an older series than that available direct from the factory or authorized dealers. Because DO Supply is not an authorized distributor of this product, the Original Manufacturer's warranty does not apply. While many Allen-Bradley PLC products will have firmware already installed, DO Supply makes no representation as to whether a PLC product will or will not have firmware and, if it does have firmware, whether the firmware is the revision level that you need for your application. DO Supply also makes no representations as to your ability or right to download or otherwise obtain firmware for the product from Rockwell, its distributors, or any other source. DO Supply also makes no representations as to your right to install any such firmware on the product. DO Supply will not obtain or supply firmware on your behalf. It is your obligation to comply with the terms of any End-User License Agreement or similar document related to obtaining or installing firmware.

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The Allen-Bradley 1785-LT4 is one version of the Classic 1785 PLC-5 Programmable Controller modules. The maximum analog I/O of this module is 512 and the program scan time is 2 ms (discrete logic) and 8 ms (typical). To optimize this scan time, divide the I/O rack between multiple channels. Place the most critical I/O on a single channel, and turn off the I/O on other channels. Because all I/O channels are independent, the remote I/O scan on one channel will not affect remote I/O scan on other channels. The Allen-Bradley 1785-LT4 has 1 DH+ port, the remote I/O transmission rate is 57.6 kbps, and the maximum user memory is 6K words. The Allen-Bradley 1785-LT4 is regarded as Industrial Equipment Class 1, Class A in accordance with Publication IEC/CISPR 11. Without appropriate precautions, there may be difficulties in ensuring electromagnetic compatibility in other environments due to conducted and radiated disturbances. The operating temperature of this module is from -25-60 °C (-13-140 °F). The nonoperating temperature of this module is from -40-85 °C (-40-185 °F). The relative humidity of the 1785-LT4 is from 5-95% without condensation. The operating vibration of this module is 2 g at 10-500 Hz. The Allen-Bradley 1785-LT4 has an operating shock of 30 g (3 pulses, 11 ms). The nonoperating shock of this module is 50 g (3 pulses, 11 ms). The 1785-LT4 has an ESD immunity of 4 kV contact discharges and 8 kV air discharges.