AB 1785-L30A is a PLC (Programmable Logic Controller) product produced by Allen-Bradley (AB, USA, also known as Rockwell). The following is a detailed introduction to the product:

1. Basic properties
Brand: Allen-Bradley (A-B Rockwell)
Model: 1785-L30A
Series: PLC5 product series
Structural form: integral
LD instruction processor: hard PLC
Installation method: control room installation
Working voltage: 220V
2. Technical specifications
I/O points: medium, ranging from 256 to 2048 points
Processing speed: 220 microseconds (μs)
Output frequency: 220Hz
Operating temperature: generally 30°C (86°F), but the operating temperature range of the Controller-XT model is -2570°C (-13158°F)

Maximum off signal delay: 11ms for resistive load
Maximum on signal delay: 1ms for resistive load
Output voltage: 120/240 VAC, output voltage range is 85~264 VAC
Backplane current consumption: 185mA (at 5V)
Current/output: 1 amp at 30°C
III. Features
As a gate driver board I/O communication module, it supports multiple communication protocols such as DataHighway Plus–DH+ messaging, Control and Information Protocol–CIP messaging, and remote I/O communication.
It can be inserted into any slot of the backplane and is compatible with a variety of ControlLogix chassis and power supplies, such as 1756-A4LXT, 1756-A5XT, 1756-A7XT, 1756-A7LXT, and standard 1756-PBXT power supplies.
It has two ports that can be selected separately for DH+ or remote I/O.
30V (continuous) isolation voltage of basic insulation type.
IV. Application fields
AB 1785-L30A is widely used in various industries such as steel, petroleum, chemical industry, electricity, building materials, machinery manufacturing, automobile, textile, transportation, environmental protection and culture, and mainly realizes the following functions:

Logic control of switch quantity: replace the traditional relay circuit to realize logic control and sequential control, which can be used for the control of single equipment, as well as multi-machine group control and automation line.
Analog quantity control: through A/D and D/A conversion modules, realize the control of analog quantity (such as temperature, pressure, flow, etc.).
Motion control: use dedicated motion control module to realize the control of circular motion or linear motion.
Process control: closed-loop control of analog quantities such as temperature, pressure, flow, etc., commonly used in metallurgy, chemical industry, heat treatment, boiler control and other occasions.
Data processing: complete data collection, analysis and processing, compare with the reference value stored in the memory, complete certain control operations, or use communication function to transmit to other intelligent devices.
Communication and networking: support communication between PLCs and between PLCs and other intelligent devices, to meet the development needs of factory automation network.