Installation Guide for Omron C1000H/C2000H Series PLC

The installation guide for Omron C1000H/C2000H series PLCs (W139-E1-42000, revised in June 2000) covers system architecture, component specifications, rack assembly, wiring specifications, environmental requirements, power design, noise protection, safety measures, supports single/dual CPU redundancy (C2000H duplex), maximum 2048 point I/O, multi rack expansion, clarifies CPU rack/expansion I/O rack configuration, power current allocation, I/O wiring and grounding standards, and is an authoritative guidance document for hardware installation, deployment, and maintenance of this series of PLCs.

System Architecture and Configuration

1. System type

Type Description Maximum I/O

C1000H single CPU rack mounted system with 1024 points (remote I/O can reach 2048 points)

C2000H Simplex single CPU, supports hot swappable I/O 2048 points

C2000H Duplex dual CPU redundancy, automatically switches between 1024 points (16 point module)/2048 points (32 point module)

2. Rack composition

CPU rack: CPU unit+CPU power supply+I/O control unit+I/O unit

Expansion I/O rack: I/O interface unit+expansion power supply+I/O unit

Duplex system: CPU rack (dual CPU+duplex unit)+independent I/O rack

Core hardware components

1. CPU power specifications

Model Input 5V Output I/O Available Current 24V Auxiliary

3G2A5-PS221-E AC100-240V 7A 4A/3A available

3G2A5-PS223-E AC100-240V 12A 9A/8A None

3G2A5-PS211-E DC24V 7A 4A/3A None

C500-PS213-E DC24V 9A 6A/5A None

2. I/O power specifications

Model Input 5V Output I/O Available Current 24V Auxiliary

3G2A5-PS222-E AC100-240V 7A 6.5A available

3G2A5-PS212-E DC24V 7A 6.5A None

3. Type of I/O unit

Input: DC24V, AC100-240V, AC/DC universal TTL

Output: Relay (2A), transistor (0.3~1A), bidirectional thyristor (1A)

Special I/O: AD/DA conversion, high-speed counting, positioning PID、PC Link

Installation and environmental requirements

Installation method

Must be installed vertically, with the CPU rack placed at the top

Rack spacing: 70~120mm

Expansion cable: maximum length of 2m per single cable, total length ≤ 12m

environmental parameters

Working temperature: 0~55 ℃

Humidity: 10%~90% RH (no condensation)

Anti vibration: 10~55Hz, 0.5mm, 2G

Wiring and grounding specifications

Grounding mandatory requirement

Grounding resistance: ≤ 100 Ω

Cable: ≥ 2mm ², length<20m

Independently grounded, not co grounded with the power system

Power wiring

AC: 100-120V/200-240V switchable

DC: 24V dedicated

Terminal torque: 1.2N · m

I/O wiring

Wire gauge: AWG22~18 (0.3~0.75mm ²)

Cold pressed terminals must be used

The distance between strong and weak electricity is ≥ 300mm

Safety and Protection

Mandatory Security

The emergency stop circuit must be implemented with external hardware

The forward and reverse rotation of the motor must be hardware interlocked

noise suppression

Inductive load parallel surge absorber/diode

Leakage current treatment: Input/output parallel discharge resistor

power-off processing

≤ 10ms: ignored

10-25ms: Possible shutdown

25ms: Stop output, power on automatically resumes

Maintenance and consumables

battery

Lifespan: 4 years (25 ℃)

Replacement: Within 1 week after the alarm, complete within ≤ 5 minutes

fuse

Specification: 3A/6.3A, 250V

The replacement must be completely powered off

relay

Lifespan: 300000 resistive cycles, 100000 inductive cycles

Key issues

Question 1: What is the core difference between C2000H duplex system and simplex system? How to achieve redundancy?

Answer: The duplex system adopts a dual CPU+duplex unit architecture, with one working and one standby, and switching without disturbance in case of failure; Single work refers to a single CPU. Duplex requires an independent I/O rack, with a maximum I/O of 1024/2048 points; Single work up to 2048 points, supports I/O hot plugging.

Question 2: What are the mandatory restrictions on the installation and expansion of this series of PLC racks? What problems will violating lead to?

Answer: It must be installed vertically, with the CPU on top and a rack spacing of 70-120mm. The single expansion cable should be ≤ 2m and the total length should be ≤ 12m. Violation can lead to insufficient heat dissipation, communication interference, I/O errors, and system instability.

Question 3: How to deal with leakage current and inductive load interference in I/O wiring? What are the risks of not handling it?

Answer: Input leakage current and discharge resistor, output leakage current and shunt resistor; Inductive load parallel surge absorber/diode. Not handling it can cause erroneous inputs, output loss of control, module breakdown, and system crashes.