VIPA CP 240 RS232, Manual

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Manual VIPA System 200V Chapter 4 CP 240 - serial
HB97E - CP - Rev. 11/30 4-39
Modbus - Error messages
At the communication at Modbus there are 2 error types:
•
Master doesn’t receive valid data
•
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.
The following error messages may occur:
ERROR01 NO DATA Error no data
No telegram arrived within the specified delay
time.
ERROR02 D LOST Error data lost
No data is available because either the receive
buffer is full or an error occurred in the receive
section.
ERROR03 F OVERF Error frame overflow
The telegram end wasn’t recognized or maximum
telegram length exceeded.
ERROR04 F INCOM Error frame incomplete
Only a part telegram has been received.
ERROR05 F FAULT Error frame Fault
The check sum of the telegram is faulty.
ERROR06 F START Error frame start
The start bit it wrong. this error may only occur
with Modbus-ASCII.
If the slave answers with an error, the function code is sent back like shown
below, marked as “or” with 80h:
DB11.DBD 0 DW#16#05900000
with 05
→
90
→
0000
→
Respond telegram
Slave address 05h
Function code 90h (error message, for 10h
OR 80h = 90h)
The rest data is not relevant, for an error
has been sent.
Overview
Master doesn’t
receive valid data
Slave answers
with error
message