195
Variable Areas
Section 7-4
7-4
Variable Areas
The areas used for data exchange when communicating with the EJ1 are
called the variable areas. Present values can be read, and set values can be
read and written using the variable areas.
Operation commands do not use the variable areas.
7-4-1
Addresses
Refer to
Parameter List
on page 233 for parameter addresses. Parameters
with the following variable types can be used with the Modbus protocol:
C4 (84), C5 (85), and D0 (90) to D6 (96).
7-4-2
Number of Elements
The number of elements is expressed in 2-byte hexadecimal format.
The range for specifying the number of elements differs for each command.
Refer to
7-5 Detailed Description of Services
.
7-4-3
Communications Data
Note
Refer to
Parameter List
on page 233.
Microprocessor
Variable area
Operation
commands and
responses
Read/write
Personal computer
EJ1
Setting (monitor) value
Communications data
(See note.)
Negative values
Decimal point
Hexadecimal
2 bytes
2's complement
The decimal point is removed and the result is
converted to hexadecimal.
Example: 105.0
→
1050
→
041A
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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