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13 MODBUS COMMUNICATION INSTRUCTION
13.1 MODBUS Read/Write
13 MODBUS COMMUNICATION INSTRUCTION
13.1 MODBUS Read/Write
ADPRW
This instruction allows the MODBUS Master to communicate (read/write data) with the Slaves.
■Descriptions, ranges, and data types
■Applicable devices
*1 T, ST, C cannot be used.
• Function code (s2) is operated on Slave node address (s1) according to Parameters (s3), (s4), and (s5)/(d1). Use 0 as the
Slave Node Address for Broadcast commands. For details, refer to MODBUS communication manual.
• The communication execution status (d2) is output according to the status of the ADPRW instruction such as
communicating/completed normally/completed with an error.
Three devices are occupied from the device specified in (d2). Make sure that these devices are not used in other controls.
Ladder diagram Structured text
ENO:=ADPRW(EN,s1,s2,s3,s4,s5d1,d2);
Operand Description Range Data type Data type (label)
(s1) Slave node address 0 to 20H 16-bit signed binary ANY16
(s2) Function code 01H to 06H, 0FH, 10H 16-bit signed binary ANY16
(s3) Function parameters depending on the function code 0 to FFFFH 16-bit signed binary ANY16
(s4) Function parameters depending on the function code 1 to 2000 16-bit signed binary ANY16
(s5)/(d1) Function parameters depending on the function code Bit/16-bit signed binary ANY_ELEMENTARY
(d2) Head bit device number to which the execution status of
the communication is output
Bit ANY_BOOL
Operand Bit Word Double word Indirect
specification
Constant Others
X, Y, M, L,
SM, F, B, SB
U\G T, ST,
C, LC
T, ST, C, D,
W, SD, SW, R
U\G Z LC LZ K, H E $
(s1)
*1
(s2)
*1
(s3)
*1
(s4)
*1
(s5)/(d1)
*1
(d2)
*1
(s1) (s2) (s3) (s4) (s5)/(d1) (d2)
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