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Diagnostics and error behavior
Diagnostics via FB STATUS
Event class 08h "Receive error"
Event class / number Description
08 16h
08 18h
08 30h
08 31h
08 32h
08 33h
08 34h
98
n
The length of a received message frame was longer than the length agreed upon.
Remedy: a correction is necessary at the partner.
n
The length of the parameterized input buffer is too short.
Remedy: the length of the input buffer must be enlarged
With (Modbus) ASCII driver only
DSR = OFF or CTS = OFF
Remedy: The partner has switched the DSR or CTS signal to "OFF" before or during a trans-
mission.
Check the partners control of the RS 232 secondary signals.
With Modbus Master only
A request message has been sent and the reply monitoring time has elapsed without the start
of a reply message being recognized.
Remedy: Check if transmission line is interrupted (interface analyzer may be required).
Check if the protocol parameters transmission rate, amount of data bits, parity, and amount of
stop bits have the same settings in CP and the link partner.
Check if the value for the reply monitoring time set with PtP_PARAM is big enough.
Check if the specified slave address exists.
With Modbus Master RTU only
The first character in the reply message from the slave is different from the slave address sent
in the request message (for operating mode "normal").
Remedy: The wrong slave has replied.
Check if the transmission line is interrupted (interface analyzer may be required).
With Modbus Master only
Overflow of receive buffer in CP during reception of the reply message.
Remedy: Check protocol settings for the slave.
With Modbus Master ASCII only
A wrong start character was received. This was not a ":" (3Ah)
Remedy: Check protocol settings for the slave.
With Modbus Master ASCII only
A start character was received within a message. The first part of the message is discarded and
reception starts again with the second start character.
Remedy: Check if transmission line is interrupted. This does not in itself fail the send job. The
error only appears in the CP diagnostics buffer.
VIPA System 300S
HB130 | CP | 341-1CH01 | en | 18-40
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