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Serial communication protocols
Deployment - Modbus > Modbus - Error messages
Write n bits 0Fh
Command telegram
Slave
Function
address
code
1byte
1byte
Respond telegram
Slave address
1byte
Write n words 10h
Command telegram
Slave
Function
address
code
1byte
1byte
Respond telegram
Slave address
1byte
5.6.4 Modbus - Error messages
Overview
Master doesn't receive
valid data
86
Code 0Fh: Write n bits to master output area 0x
Please regard that the number of bits has additionally to be set in byte.
Address 1.
Number of
bit
bits
1word
1word
Function code
1byte
Code 10h: Write n words to master output area 4x
Address 1.
Number of
word
words
1word
1word
Function code
1byte
At the communication with Modbus there are 2 error types:
n
Master doesn't receive valid data
n
Slave responds with error message
If the slave doesn't answer within the specified delay time or if a telegram is defective, the
master enters an error message into the receive block in plain text.
Number of
Data 1.
bytes
byte
1byte
1byte
Address 1. bit
1word
Number of
Data 1.
bytes
word
1byte
1word
Address 1. word
Number of words
1word
VIPA System SLIO
Data 2.
...
byte
1byte
1byte
max. 250byte
Number of bits
1word
Data 2.
...
word
1word
1word
max. 125words
1word
HB300 | CP | 040-1CA00 | en | 18-28
Check
sum
CRC/LRC
1word
Check sum
CRC/LRC
1word
Check
sum
CRC/LRC
1word
Check sum
CRC/LRC
1word
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