Modbus Exception Codes; Table 16: Exception Codes - ABB AWIN GW120 User Manual

M O DBU S E XCE PT IO N CO DE S
Problem
Device is stuck in handshak-
ing state
Error Retrieving AP Mote
Data From Network Manager
Network Manager Has Reset. Wait for System Recovery to automatically initiate system recovery. It is of-
8.3

Modbus Exception Codes

The following exception codes are supported.
Exception code
0x01 ILLEGAL_FUNCTION
0x02 ILLEGAL_DATA_ADDRESS
0x03 ILLEGAL_DATA_VALUE
0x06 SLAVE DEVICE BUSY
0x0b GATEWAY TARGET DEVICE
FAILED TO RESPOND
56
Solution
Reboot the device stuck in handshaking state. If not possible, then reform
network or power cycle the gateway.
Note: Power cycling the gateway or reforming the network will force all de-
vices to drop off the network and reconnect. This will impact network
availability.
Wait for System Recovery to automatically initiate system recovery. It is of-
ten seen during the boot up process. If this error is persistent after 10+
minutes of boot up then a power cycle may be required.
ten seen during the boot up process or during network configuration. If
this error is persistent after 10+ minutes of boot up then a power cycle
may be required.

Table 16: Exception codes

Meaning
No request bytes present.
Starting address does not exist in mapping.
Starting register valid, but length of requests spans at least one un-
mapped register.
WirelessHART device is disconnected in simplified in mapping.
Slave is engaged in processing another command. Retry later.
This can happen when:
– The data is stale. This can be either because the data is old, or be-
cause the device is responding with a non-successful response
code.
– There is an update to the Modbus mapping in progress.
Indicates that no response was obtained from the target device.
This can happen when:
– Device is disconnected.
– Sending request to WirelessHART network failed.
To avoid Modbus exception notification, read each individual device data inde-
pendently. In a case of device disconnection, if you try to read data from multi-
ple devices in one block read, it will result in complete Modbus block read error.
TR O U B LES HO O T I NG
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