4

EJ1

Communications Specifications

*1. Connection from the EJ1C-EDU. When using an HFU, port B on the End Unit can be used for distributed placement only.

*2. A special cable (EJ1C-CBLA050) must be purchased separately for the G3ZA connection.

*3. For the number of Units that can be connected, refer to “Connection Precautions” on page 11.

*4. The Modbus protocol can be used with Basic Unit with version 1.1 or higher.

Current Transformer (CT) Rating

Characteristics of the Heater Burnout

Alarm, SSR Failure Alarm, and Heater

Overcurrent Alarm

(TC2

@-QNHB Model

Only)

*1. When the control output ON time is less than 100 ms, heater

burnout detection, heater overcurrent detection, and heater

current measurement are not performed.

*2. When the control output OFF time is less than 100 ms, SSR

failure alarm and leakage current measurement are not

performed.

Item

Port B

*1

Port A Terminal/ Port A Connector

*1

G3ZA Connection Port

*2

Transmission path

connection

RS-485 (multipoint)

Communications

method

RS-485 (two-wire, half duplex)

Synchronization

method

Start-stop synchronization

Communications

protocol

CompoWay/F, Modbus

*4

CompoWay/F

Baud rate

9.6, 19.2, 38.4, 57.6, or 115.2 kbps

38.4 kbps fixed

57.6 kbps fixed

Transmission

code

CompoWay/F: ASCII, Modbus: RTU

CompoWay/F: ASCII

Data bit length

7 or 8 bits

7 bits

Stop bit length

1 or 2 bits

2 bits

Error detection

Vertical parity (none, even, or odd)

Vertical parity (even)

Block check character (BCC): with CompoWay/F, CRC-16: (with Modbus)

Flow control

None

Interface

RS-485

Retry function

None

Communications

response wait time

0 to 99 ms (default: 5 ms)

1 to 99 ms (default: 1 ms)

---

Number of Units

that can be

connected in

parallel

*3

64 Units (model numbers with TC4: 256

channels, model numbers with TC2: 128

channels)

Communications connection via port B

on the End Unit

64 Units (model numbers with TC4: 256

channels, model numbers with TC2: 128

channels)

Communications connection via port A

on the End Unit

8 Units (Communications connection

via G3ZA port on the Basic Unit)

V1.1

V1.1

Dielectric

strength

1,000 VAC for 1 min

Vibration

resistance

50 Hz, 98 m/s2

Weight

E54-CT1: Approx. 11.5 g, E54-CT3: Approx. 50 g

Accessories

(E54-CT3 only)

Armatures (2), plugs (2)

Maximum

heater current

100 VAC

Input current

indication

accuracy

(±5.0A) ±1 digit max.

Heater

burnout alarm

setting range

0.1 to 99.9 A (in units of 0.1 A)

0.0 A: Heater burnout alarm output turns OFF.

100.0 A: Heater burnout alarm output turns ON.

Min. detection ON time: 100 ms

*1

SSR failure

alarm setting

range

0.1 to 99.9 A (in units of 0.1 A)

0.0 A: SSR failure alarm output turns ON.

100.0 A: SSR alarm output turns OFF.

Min. detection OFF time: 100 ms

*2

Heater

overcurrent

alarm setting

range

0.1 to 99.9 A (in units of 0.1 A)

0.0 A: Heater overcurrent alarm output turns ON.

100.0 A: Heater overcurrent alarm output turns OFF.

Min. detection ON time: 100 ms

*1