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/s
2
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%FS ±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
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