Advertisement
4 Modbus Communications Procedure
Writing Undisplayed Parameters
It is possible to write the parameters that are not displayed due to display settings as well as the
parameters that are never displayed in the Controller.
• Example Command and Response
The following example shows the command/response when writing the Alarm Value Upper Limit 1
and Alarm Value Lower Limit 1 parameters.
(In this case, the slave address is H'01.)
Four-byte Mode
Alarm Value Upper Limit 1
• Address: H'010A; Write data: H'000003E8 (when 1000)
Alarm Value Lower Limit 1
• Address: H'010C; Write data: H'FFFFFC18 (when −1000)
Command:
Response:
Two-byte Mode
Alarm Value Upper Limit 1
• Address: H'2105; Write data: H'03E8 (when 1000)
Alarm Value Lower Limit 1
• Address: H'2106; Write data: H' FC18 (when −1000)
Command:
Response:
4-4-3 Variable Write, Single/Operation Command
This function performs operations such as writing to the variable area (single) and operation commands
(communications writing, RUN/STOP, multi-SP, AT execute/cancel, write mode, save RAM data, soft-
ware reset, move to setup area 1, move to protect level, auto/manual switch, initialize settings, alarm
latch cancel, invert direct/reverse operation, PID update (adaptive control), program start, and auto-
matic filter adjustment.)
Writing is enabled in only the 2-byte mode.
Command Frame
Slave
Function
address
code
H'06
1
1
Response Frame
Slave
Function
address
code
H'06
1
1
(1) Write variable address
Specify the address of the setting data that is to be written. For details on addresses, refer
to Section 5 Modbus Communications Procedure.
For an operation command, specify 0000 or FFFF.
4 - 12
01
10
01 0A
00 04
08
01
10
01 0A
00 04
E0 34(CRC-16)
01
10
21 05
00 02
04
01
10
21 05
00 02
5B F5(CRC-16)
Write variable
Write data
address
2
Write variable
address
Write data
2
E5@D Digital Temperature Controllers Communications Manual (H225)
00 00 03 E8
FF FF FC 18
8D E9(CRC-16)
03 E8
FC 18
66 BB(CRC-16)
CRC-16
2 bytes
2
CRC-16
2 bytes
2
Advertisement
