Chapter 6 Applied Instructions
6-519
API
Instruction code Operand Function
2205 EMDRW P
S
1
, S
2
, S
3
, S, n
Reading/Writing the Modbus TCP
data
Device
X Y M S T C HC D L SM SR E PR K 16# “$” DF
Pulse instruction 16-bit instruction (11 steps)
32-bit instruction
AH500 AH500 -
Symbol:
S
1
：
Unit address Word
S
2
：
Function code Word
S
3
：
Device address Word
S
：
Register involved in the
reading/writing of the data
Bit/Word
n
：
Data length Word
Explanation:
1. Before using the instruction, users have to accomplish the following setting in ISPSoft.
PLC Parameter Setting→Ethernet-Basic→Setting the IP addres and the netmask
address
2. Setting S
1
:
S
1
Station address
The station address should be within the range between
0 and 255.
S
1
+1
Remote IP address
(high word)
Example: The remote IP address is 172.16.144.230.
S
1
+1=16#AC10
S
1
+2=16#90E6
S
1
+2
Remote IP address
(low word)
S
1
+3
Whether to close the
connection
0: The connection is closed after the execution of the
instruction is complete.
1: The connection is persistent. (The closing of the
connection depends on the setting of the TCP
keepalive timer.)
S
2
: Function code
For example:
1 (16#01): The AH500 series PLC reads the data from several bit devices which are not
discrete input devices.
2 (16#02): The AH500 series PLC reads the data from several bit devices which are discrete
input devices.
3 (16#03): The AH500 series PLC reads the data from several word devices which are not
input registers.
4 (16#04): The AH500 series PLC reads the data from several word devices which are input
registers.
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