190
Communications Settings
Section 7-1
7-1
Communications Settings
Communications are programmed on the host computer. Descriptions of com-
munications in this manual are therefore written from the viewpoint of the host
computer. For example, references to reading and writing mean reading data
from the EJ1 to the host computer and writing data from the host computer to
the EJ1.
The EJ1 uses different communications specifications from existing products
to improve communications operability.
Parameter Validity
The conditions for parameter validity that depended on the model and setting
status no longer apply.
Fixed Values for
Setting Ranges
For example, the setting range for the target value is fixed to
−
1,999 to 9,999,
regardless of the input type. In other words, the setting ranges under the new
specifications will not change based on the input type or related parameters.
For parameters that set ranges with upper and lower limits, the specifications
now allow the upper and lower limits to be reversed.
Refer to
4-1-3 Analog Inputs, 4-3-4 Setting the Set Point, and MV Limiter
on
page 77
in Section 4 Basic Units (TC4/TC2)
before using the EJ1.
Automatic Offsetting
of Setting Values
Accompanying changes outlined under
Fixed Values for Setting Ranges
above, there are no longer any restrictions in operations for the target value
limiter or target values for changes in the input type. Under the new specifica-
tions, there is also no need to change control output assignments when oper-
ations, such as selecting heating and cooling, are performed.
Refer to
4-2-1 Control Output Assignments, Heating/Cooling Control
on
page 69
, and 4-3-4 Setting the Set Point in Section 4 Basic Units (TC4/TC2)
before using the EJ1.
7-1-1
Communications Specifications
EDU (Port B)
The following communications settings are used.
Parameter name
Settings
EDU (Port B)
Transmission path connection
Multipoint
Communications
RS-485
Synchronization method
Start-stop synchronization
Transmission code
RTU (Remote Terminal Unit)
Error detection
CRC-16 (Cyclical Redundancy Check)
Flow control
None
Retry function
None
Parameter name
Setting range
Default
Setting method
Unit number
00 to 63
01
SW1/SW2
Port B communications
protocol
0: CompoWay/F
1: Modbus
0: CompoWay/F Communications or
SW2
Port B communications
baud rate
3: 9.6
4:19.2
5: 38.4
6: 57.6
7: 115.2 (kbps)
3: 9.6 (kbps)
Communications or
SW2
V1.2
V1.2
Summary of Contents for EJ1 EtherCAT
Page 2: ...EJ1 Modular Temperature Controllers User s Manual Revised July 2008 ...
Page 3: ...iv ...
Page 19: ...xx ...
Page 213: ...188 Detailed Description of Services Section 6 4 ...
Page 227: ...202 Detailed Description of Services Section 7 5 ...
Page 303: ...278 Index ...
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