Allen-Bradley SLC 500 SYSTEMS SELECTION GUIDE

Product Overview

The Allen Bradley SLC 500 is a modular programmable logic controller (PLC) system introduced by Rockwell Automation, with document version 1747-SG001E-EN-E (February 2013). Its core positioning is to provide flexible and scalable control solutions for industrial scenarios. The system adopts a modular design, which can combine processors, racks, power supplies, I/O modules, and communication modules according to requirements, adapting to diverse needs from basic logic control to complex process control and motion control. It is widely used in multiple industries such as manufacturing, plastics, water treatment, metallurgy, etc.

The system has industrial grade reliability and has passed multiple certifications such as UL, c-UL, CE, etc. It operates within a temperature range of 0-60 ℃ and can withstand harsh industrial environments such as vibration and impact. It supports multi network communication and remote programming maintenance, making it a classic solution in the field of industrial automation.

Detailed explanation of core hardware components

1. Processor module (5 core models)

The SLC 500 series processors are divided into 5 types according to their functional strength, and the core parameters are shown in the following table:

Model Memory Options Core Instruction Count Communication Interface Maximum I/O Capacity Typical Scan Time Features

SLC 5/01 1K/4K words 52 DH-485 (slave) 3940 point 8ms/K instruction basic logic control, entry-level

SLC 5/02 4K/8K/16K words 71 DH-485 4096 point 4.8ms/K instruction enhanced diagnosis, supporting complex instructions

SLC 5/03 8K/16K/32K words 107 RS-232+DH-485 4096 points 1ms/K instructions built-in RS-232, supports external intelligent devices

SLC 5/04 16K/32K/64K words 107 RS-232+DH+4096 point 0.9ms/K instruction high-speed DH+communication, plastic industry special version (SLC 5/04P)

SLC 5/05 16K/32K/64K words 107 RS-232+EtherNet/IP 4096 points 0.9ms/K instructions 10/100Mbps Ethernet, supports network upload and download

Common specifications: All models support 1-3 local rack extensions (30 slots in total), with a bit execution time of 0.37 μ s-4 μ s. Some models support real-time clock (accuracy ± 54 seconds/month @ 25 ℃).

Accessories: Optional EEPROM/Flash memory module (1747-M1/M2/M13), lithium battery (1747-BA), program storage device (1747-PSD).

2. Rack and Expansion

The rack is used to install processors, I/O modules, and power supplies, with the following core parameters:

Model, number of slots, adaptation, power expansion, usage

1746-A4 4-slot full series power rack interconnect cables for small systems with limited space

1746-A7 7-slot full series power rack interconnection cable medium-sized system, conventional expansion

1746-A10 10 slot full series power rack interconnection cable large system, multi module configuration

1746-A13 13 slot full series power rack interconnection cable super large system, complex control scenarios

Expansion accessories: Rack interconnect cable (1746-C7/C9/C16, up to 1.27m), slot filler (1746-N2, dust-proof).

3. Power module (7 types, divided into AC/DC input)

Each rack needs to be independently configured with a power supply, and the core parameters are as follows:

Model Input Voltage 5V Output Current 24V Output Current Maximum Input Current Features

1746-P1 85-265V AC 2A 0.46A 20A basic model, low power consumption

1746-P2 85-265V AC 5A 0.96A 20A mainstream model, medium load

1746-P4 85-250V AC 10A 2.88A 45A high-power model, total power ≤ 70W

1746-P3 19.2-28.8V DC 3.6A 0.87A 20A medium voltage DC input

1746-P5 90-146V DC 5A 0.96A 20A High Voltage DC Input

1746-P6 30-60V DC 5A 0.96A 20A medium high voltage DC input

1746-P7 10-30V DC 2A (12V input)/3.6A (24V input) 0.46A (12V input)/0.87A (24V input) – Low voltage DC input, isolated design

Common specifications: Operating temperature range of 0-60 ℃ (with a 5% derating for P1/P2 and other temperatures above 55 ℃), supporting a short-term power outage tolerance of 20ms-3s, and equipped with a power status LED indicator light.

4. I/O modules (over 60 types, divided into four categories)

(1) Digital I/O module

Covering 4-32 channels, supporting AC/DC/relay output, core parameter example:

Type, Model, Example, Channel Number, Voltage Level, Key Characteristics

Direct current input (sinking) 1746-IB16 16 24V DC response time 8ms, rated current 8mA

DC input (sourcing) 1746-IV16 16 24V DC response time 8ms, 8mA rated current

DC output (sourcing) 1746-OB16 16 24V DC 0.5A/point, electronic protection

Communication input 1746-IA16 16 16 100/120V AC response time 35ms, 12mA rated current

Communication output 1746-OA16 16 16 120/240V AC 0.5A/point, bidirectional thyristor

Relay output 1746-OW8 8 5-265V AC/5-125V DC 1A/point, mechanical contact

Combination I/O 1746-IO8 4-in-4-out 120V AC input/relay output integrated input/output, saving slot space

(2) Analog I/O module

Supports voltage (± 10V), current (4-20mA) input and output, core parameters:

Type Model Example Channel Number Resolution Accuracy Response Time

Analog input 1746-NI4 4 4 16 bit ± 0.365% FS 60ms

Analog input 1746-NI8 8 16 bit ± 0.1% FS 0.75ms/channel

Analog output 1746-NO4I 4 14 bit ± 0.298% FS 2.5ms

Analog input-output combination 1746-NIO4I 2 in 2 out 16 bit (input)/14 bit (output) ± 0.510% FS (input) 100 μ s (input)

(3) Temperature module

Supports thermocouples and RTDs, core parameters:

Type Model Example Channel Number Adaptation Sensor Accuracy Cold End Compensation

Thermocouple module 1746-NT4 4 4 J/K/T/E/R/S/B/N ± 1.06 ℃ (J-type) integrated cold junction compensation

Thermocouple module 1746-INT4 4 with C/D type thermocouple ± 1.6 ℃ (J-type) integrated cold junction compensation

RTD Module 1746-NR4 4 Platinum/Nickel/Copper RTD ± 0.5 ℃ (Platinum 100 Ω) Automatic Calibration

(4) Special function module

Module Type Model Example Core Function Key Parameters

High speed counting 1746-HSCE 1 channel bidirectional counting 50kHz frequency, 16 bit counting range

Motion control 1746-HSRV single axis servo control 300kHz encoder feedback

Step control 1746-HSTP1 single axis step control 250kHz pulse output

BASIC language 1746-BAS data acquisition and reporting 24K RAM, RS-232/485 communication

Process control 1746-BTM 4-zone PID temperature control supports hot/cold control, 16 bit resolution

Communication and Programming

1. Communication Network and Modules

The system supports multiple industrial networks, and the core communication scheme is as follows:

Network type, core equipment, communication speed, maximum distance, usage

EtherNet/IP SLC 5/05 processor, 1761-NET-ENI 10/100Mbps 100m (twisted pair) enterprise level interconnection, remote programming

ControlNet 1747-SCNR (scanner), 1747-ACN15 (adapter) 5Mbps 1000m (coaxial cable) real-time control, I/O synchronization

DeviceNet 1747-SDN (scanner), 1761-NET-DNI 125/250/500Kbps 500m sensor/actuator interconnection

DH+SLC 5/04 processor, 1784-PKTX 57.6K-230.4Kbps 3048m controller to controller communication

DH-485 1747-AIC (coupler), 1747-KE 19.2Kbps 1200m low-cost device interconnection

RS-232 processor built-in channel 300-1920bps 15m local programming, modem connection

2. Programming software

Software Name: RSLogix 500

Core functions: ladder logic programming, I/O configuration, diagnostic tools, data monitoring, program upload and download

Operating environment: Windows system

Auxiliary tools: RSLinx (communication driver), RSNetWorx (network configuration), 1747-WINBAS (BASIC module programming)

System configuration and expansion

Configuration process: Determine I/O requirements → Select I/O modules → Match processors (memory/communication) → Select rack (number of slots) → Configure power supply (load accounting) → Add communication modules → Programming and debugging

Expansion limit: Up to 3 local racks, with a total of 30 slots; Maximum I/O capacity of 4096 inputs+4096 outputs; The number of communication nodes depends on the network type (DH-485 has a maximum of 32 nodes)

Wiring accessories: 1492 series interface module (IFM), pre wired cable (1492-CABLE), supporting fast wiring and fault diagnosis

Environmental and Safety Specifications

Project specifications

Working temperature 0-60 ℃

Storage temperature -40-85 ℃

Relative humidity 5-95% (non condensing)

Vibration (working) 1g @ 5-2000Hz (IEC 60068-2-6)

Impact (working) 30g (3 pulses, 11ms)

Isolation voltage communication circuit between 500V DC; 1500V AC between backplane and I/O

Hazardous Area Certification Class I, Division 2 Group A/B/C/D