Omron CPM2B Board PLC Practical Guide

Environmental temperature 0~55 ℃ (storage -20~75 ℃)

Humidity 10%~90% without condensation

Non corrosive gas, conductive dust

Vibration: amplitude of 0.075mm at 10~57Hz, acceleration of 9.8m/s ² at 57~150Hz, 80 minutes on each of the three axes

Special note:

Installation direction: Vertical installation (terminal downward or side downward is acceptable), but cannot be installed horizontally, otherwise the heat dissipation will deteriorate and it needs to be downgraded for use (refer to the output current derating curve in the manual).

The CPU board and expansion board are connected through CPM2B-CN601 expansion cable (60mm). The cable plug has a locking buckle, which must be ensured to be fully locked.

CPM2B-ATT01 mounting bracket must be used to meet UL/CSA standards. The screw torque is 1.2N · m.

3.2 Power Wiring

The power terminal is made of M3 screws, with a recommended torque of 0.5~0.6N · m. Stripping length 7mm, suitable for wires 0.2~2.5mm ² (AWG24~12). Power requirements:

24V DC model: 20.4~26.4V DC

12V DC model: 10.8~13.2V DC

Power consumption: Maximum 20W (CPU board)

Surge current: maximum 20A (<2ms)

Warning:

The power supply must use double insulated or reinforced insulated SELV/PELV power supply to meet the low voltage command (LVD).

If the equipment needs to comply with the EMC directive, noise suppression measures (such as RC absorption circuits or varistors) must be added on the load side when the relay output switching frequency is ≥ 5 times/minute.

It is strictly prohibited to plug and unplug expansion cables or I/O connectors while powered on.

3.3 I/O Wiring

Input specifications (typical value, 24V DC model):

Input impedance: IN00000~00001 is 2.7k Ω, IN00002~00006 is 3.9k Ω, IN00007 and above is 4.7k Ω

ON voltage/current: ≥ 17V DC/5mA (IN00000~00001), ≥ 14.4V DC/3mA (other)

OFF voltage/current: ≤ 5V DC/1mA

Input response time: programmable settings (1, 2, 3, 5, 10, 20, 40, 80ms), default 10ms

Minimum pulse width for high-speed counter/interrupt input (IN00000~00006): 12.5 μ s for differential phase mode, 50 μ s for other modes

Output specifications (transistor sinking type):

Rated current: OUT01000 and OUT01001 are 0.2A (4.5~30V DC), while other points are 0.3A

Public end capacity: 1.2A

Leakage current: ≤ 0.1mA

Residual voltage: ≤ 1.5V

ON/OFF response time: The first two points are about 20 μ s/40 μ s, and the other points are 0.1m/1ms

Relay output:

Maximum switch capacity: 2A 250V AC or 2A 24V DC (4A per common terminal)

Electrical lifespan: 150000 times for resistive loads and 100000 times for inductive loads

ON/OFF delay: 15ms (typical)

Wiring precautions:

When using two-wire sensors (proximity switches, photoelectric switches), if the leakage current is greater than 1.0mA (2.5mA for IN00000~00002), a discharge resistor should be connected in parallel at the input end. Calculation formula: R=(24- Ec)/(I2 leak - I2 OFF), where Ec=5V and I2 OFF=1mA.

When driving inductive loads (relays, solenoid valves), it is necessary to parallel a freewheeling diode (DC circuit) or an RC absorption circuit (AC circuit), otherwise it will seriously shorten the contact life or damage the transistor.

When driving loads with high surge currents such as incandescent lamps, it is recommended to connect current limiting resistors in series or add buffer circuits.

Use a crimp terminal to connect the terminal block, and do not directly screw in loose wires. The torque of the terminal screw is 0.5~0.6N · m.

3.4 Analog I/O Wiring

The analog board provides a dedicated 15 pin connector (XM2D-1501), which requires the use of shielded twisted pair cables. Key points of wiring:

Voltage input: Connect the positive terminal to the corresponding input pin and the negative terminal to AG (analog ground). Unused input channels, short circuit the positive and negative.

Current input: It is necessary to turn the corresponding pin of DIP switch 1 to ON (bottom), and then connect the positive current signal and negative AG.

Voltage output: Connect the output voltage signal to the corresponding output pin, and connect COM to AG.

Current output: DIP switch 1 is also required for setting, with the output signal connected to the current output pin and COM connected to AG.

Wire breakage detection is only applicable within the range of 1-5V or 4-20mA. When the voltage is less than 0.8V or the current is less than 3.2mA, the converted data output is 8000 (hexadecimal) without generating an error flag. The user program needs to make its own judgment.

Attention: If multiple voltage input devices share the same power supply and the line is disconnected, it will generate crosstalk voltage. It is recommended to use an independent power supply or add an isolator for each input.

Memory allocation and PLC settings

4.1 I/O Storage Area

Description of Regional Address Size

160 point actual input terminal mapping for input positions IR000~IR009

Output bit IR010~IR019 160 point actual output terminal mapping

Internal intermediate relay at positions IR020~IR049, IR200~IR227 928

Special auxiliary area SR228~SR255 448 point marker and control bit

Maintain power outage from HR00 to HR19 at 320 points

Auxiliary area AR00~AR23 384 point system flags and error flags