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WPMZ Series Modbus communication instruction manual
IM-0862-02
Number of pages:109
15
11H
Return Server Busy Count
Returns the number of times slave, busy, exception
response returned by the specified slave.
12H
Return Bus Character Overrun Count
Returns the number of times a character overrun
error occurred on the specified slave.
Diagnostic function communication example
Communication is performed with the diagnosis subcode 00H (Return Query Data) for the module
with slave ID 01H.
An example of specifying 55AAH for write word data is shown below.
・Transmission data (master
→
slave (module))
Table 3.14 Function code 08H Transmission data
n ame
Tran smi tte d
da ta
S l a v e ID
0 1 H
Fu n c ti on c o de
0 8 H
D i a g n o s t i c s u b c o d e
U p p e r
0 0 H
Lo w e r
0 0 H
D a t a f i e l d
U p p e r
5 5 H
Lo w e r
A AH
Er r o r c h e c k
( C R C - 1 6 )
Lo w e r
5 F H
U p p e r
2 4 H
・Received data (slave (module)
→
master)
Table 3.15 Function code 08H Receive data
n ame
Re c e i ve d
da ta
S l a v e ID
0 1 H
Fu n c ti on c o de
0 8 H
D i a g n o s t i c s u b c o d e
U p p e r
0 0 H
Lo w e r
0 0 H
D a t a f i e l d
U p p e r
5 5 H
Lo w e r
A AH
E r r o r c h e c k
( C R C - 1 6 )
Lo w e r
5 F H
U p p e r
2 4 H