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WPMZ Series Modbus communication instruction manual
IM-0862-02
Number of pages:109
20
3-5.
Error Message
If there is an error in the message sent from the master, an error message is returned from the slave
(module).
When an error message is returned, check the transmission data.
Table 3.19 Contents of error message (slave (module)
→
master)
n a me
S l a v e ID
Re c e i v e d fu n c ti on c o de + 8 0 H
Err or c ode (se e tabl e b e l ow )
Er r o r c h e c k
( C R C - 1 6 )
Lo w e r
U p p e r
Table 3.20 Error code contents
Err or c ode
Con te n ts
De sc ri p ti on
0 1 H
Fu n c ti on c o de
de fe c t
Th e mo du l e re c e i ve d a fu n c ti on c o de th a t
doe s n o t c o rre s pon d .
0 2 H
A dd re s s pr obl e m
Th e mo du l e re c e i ve d a n on - c o m pl i an t
a dd re s s .
0 3 H
Nu m be r of da t a
e rro rs
Th e s pe c i fi e d n u m be r o f da ta i s to o l ar ge .
0 6 H
Sl a v e bu sy
Th e mo du l e i s bu sy.
◎Error example
Response in case an address error occurs in the function code 04H from the module with the slave ID
01H
Table 3.21 Example of received data in case of error
n a me
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
8 4 H
Er r o r c o d e
0 2 H
E r r o r c h e c k
( C R C - 1 6 )
Lo w e r
C 2 H
U p p e r
C 1 H