Variable Write, Multiple - Omron E5CC Communications Manual

4 Modbus Communications Procedure

4-4-2 Variable Write, Multiple

To write data to the variable area, set the required data in the command frame, as shown in the follow-
ing diagram.
Command Frame
Slave
Function
address
code
H'10
1 1
Name
Slave address
Function code
Write start address
Number of elements
Byte count
CRC-16
4 - 10
Number of
Write start address
Elements
2 2
Specify the E5@C's unit number.
The unit number can be set between H'01 and H'63 hexadecimal (1 to 99 decimal).
The Write Variable Area function's function code is H'10.
Specify the starting address where the setting data will be written.
Refer to Section 5 Communications Data for Modbus for details on addresses.
4-byte Mode
Specify 2 times the number of setting data items as the number of elements to be
written.
The setting range for the number of elements is H'0002 to H'0068 (2 to 104).
When H'0068 is set, 52 items of setting data can be read.
Example: When writing 2 items of setting data, set the number of elements to
H'0004.
2-byte Mode
Specify the number of setting data items to be written as the number of elements.
The setting range for the number of elements is H'0001 to H'0068 (1 to 104).
When H'0068 is set, 104 items of setting data can be read.
Example: When reading two items of setting data, set the number of elements to
H'0002.
Specify the number of bytes of write data.
This check code is calculated with the data from the slave address to the end of the
data.
For details on the CRC-16 calculation, refer to CRC-16 Calculation Example in 4-1-1
Command Frame on page 4-2.
Write data (for the number of
Byte count
elements)
0 to 208 (2 × 104)
1
Description
E5@C Digital Temperature Controllers Communications Manual (H175)
CRC-16
2