12

EJ1

Restrictions on Unit Placement

Always connect the HFU on the left side of the Basic Unit.

Insulation Blocks

Each EJ1 Unit is electrically insulated for each function block as shown in the following figures.

Functional insulation is applied between the power supply, input, output, and communications terminal sections.

If reinforced double insulation is required, use power supplies that comply with IEC60664 for reinforced double insulation for the EJ1's external

power supply and for power supplies connected to the EJ1.

Programless Communications

Communications with PLCs from OMRON (CS/CJ/CP/NJ Series) and Mitsubishi Electric (MELSEC-Q/QnA/QnAS/An/Ans/FX3UC Series) can be

performed without creating ladder programming.

Using programless communications enables monitoring and changing settings for the EJ1 by simply reading and writing to PLC memory.

The EJ1 automatically performs communications with the PLC, which reduces work hours spent programming for communications from the PLC to the EJ1.

Connectable Devices

Connecting an EJ1 Controller 1:1 to a PLC

CS/CJ/CP/NJ Series

*1. Only the CJ1W-SCU@2 Serial Communications Unit can be used to connect to an NJ-series Controller.

*2. Use only products manufactured on or after December 20, 1999.

For details, refer to the CS/CJ Series, Serial Communications Boards/Units Operation Manual (Cat. No. W336).

COM1

COM2

COM3

PWR

RUN

ERR

ALM

SW1

ON

SW2

EJ1-HFU

CDEF

COM1

COM2

COM3

PWR

RUN

ERR

ALM

SW1

ON

SW2

EJ1-TC4

CDEF

EJ1N-HFU

EJ1N-TC4 or

EJ1N-TC2

Power

supply

Transistor outputs 1 to 4

Communications (Port B, port C)

Event inputs 1 to 4

Functional isolation

Power

supply

Transistor outputs 1 and 2

Communications (Port A, port B)

Functional isolation

EJ1N-HFU

@-NFL@

Input 1

Power

supply

Input 2

Event inputs 1 and 2, CT1 and 2

*

Communications (Port A, port B, G3ZA)

Transistor outputs 3 and 4

Voltage outputs 1 and 2/Current outputs 1 and 2

Functional isolation

Input 1

Power

supply

Input 2

Input 4

Voltage outputs 1 to 4

Communications (Port A, Port B, G3ZA)

Input 3

Functional isolation

EJ1N-TC2

EJ1N-TC4

EJ1C-EDU

* Not provided on models with current outputs.

Name

Model No.

Communications ports

Port 1

Port 2

Serial Communications Units

*1

CJ1W-SCU21-V1

RS-232C

RS-232C

CJ1W-SCU22

CJ1W-SCU31-V1

RS-422A/485

RS-422A/485

CJ1W-SCU32

CJ1W-SCU41-V1

RS-422A/485

RS-232C

CJ1W-SCU42

CS1W-SCU21-V1

*2

RS-232C

RS-232C

CS1W-SCU31-V1

RS-422A/485

RS-422A/485

Serial Communications Boards

CS1W-SCB21-V1

*2

RS-232C

RS-232C

CS1W-SCB41-V1

*2

RS-232C

RS-422A/485

CPU Units

CJ Series

---

RS-232C

CS Series

---

RS-232C

CJ2M-CPU3

@ Series

---

RS-232C or RS-422A/485 can be

used by adding an Option Board.

CP Series

RS-232C or RS-422A/485 can be used by adding an Option Board.

PV

PLC

The read monitor value is

written to the PLC memory.

The read setting is written to the

setting for the EJ1N-TC4/TC2.

Manipulated variable

Status

SP

Monitor

Setting

Alarm value 1

Alarm value 2

EJ1N-HFU

EJ1N-TC4/TC2

The EJ1N-HFU automatically

performs communications

with the PLC.

The EJ1N-HFU reads the value

written to the PLC memory.

The EJ1N-HFU reads the monitor

value for the EJ1N-TC4/TC2.

Monitoring can be

performed for the

EJ1 and the settings

can be changed by

simply reading and

writing to memory.

PV

Manipulated variable

Status

SP

Alarm value 1

Alarm value 2

PV

Manipulated variable

Status

SP

Alarm value 1

Alarm value 2