Siemens NAN 67 Series Bedienungsanleitung PDF herunterladen (Seite 32)

Modbus RTU Exception Codes

26 Modbus® RTU Serial Communications User Manual 02/13

Table 4-1 Modbus RTU Data Layer Status Exception Codes

Exception

Code

Definition Description

Illegal Function The message received is not an allowable action for

the addressed device.

Illegal Data Address The address referenced in the function-dependent data

section of the message is not valid in the addressed

device.

Illegal Data Value The value referenced at the addressed device location

is no within range.

Slave Device Failure The addressed device has not been able to process a

valid message due to a bad device state.

Slave Device Busy The addressed device has ejected a message due to a

busy state. Retry later.

NAK,

Negative Acknowledge

The addressed device cannot process the current

message. Issue a PROGRAM POLL to obtain device-

dependent error data.

Buffer Overflow The data to be returned for the requested number of

registers is greater than the available buffer space.

Function Code 20 only.

1 2 ... 27 28 29 30 31 32 33 34 35 36 37 ... 75 76

Keine Kommentare

Siemens NAN 67 Series Bedienungsanleitung Seite 32