MOD BUS EXC EPTIO N CO DES
TROU BLES HOOTING
52
3BNP1029 12 C
Problem
Solution
Verify WirelessHART field device, adapter or wired HART device sup-
ports the command.
Trying to read data from unmapped register will result in exception.
Device connects and discon-
nects
If the device does not have good radio signal, then it can have unsta-
ble connection. This can be seen by looking into RSSI, latency, stabil-
ity and number of joins in network statistics page. If the number of
joins keep going up, then add repeater nodes (if possible) to im-
prove network reliability, stability and availability.
RSSI of the device’s active link should be better than -75dBm.
Unable to connect new de-
vice
If it is not possible to add a new device, make sure that there is re-
maining capacity left in the gateway to add new device. To check,
login to the network statistics page. Up to 24 devices can connect to
AWIN GW100.
Connected devices number can be reduced to 8 if all devices burst 3
messages simultaneously at 1sec update period.
I/O Schedule Upload Failed
When downloading the devices configuration to a gateway where
some devices are offline will result in this error. This error is followed
with a summary of device(s) which failed. For all other devices, con-
figuration upload is successful.
Try to bring the offline device online and import again.
Low battery lifetime
If a device shows low battery lifetime then replace its battery by fol-
lowing the service manual of that device.
Radio signal is weak
Make sure there is clearance around the antenna. Look into the
guidelines for installation of antenna in the antenna used in the
setup.
Weak mesh network
Login to the network statistics page and verify that each device can
communicate to at least 3 neighbors (recommended). If so, the de-
vice row will be color coded green.
If not, make sure that all connected devices are operating as mesh
nodes (i.e., routing enabled). You can verify this by logging into the
monitor account and looking at
Devices Information
page. To ena-
ble/disable routing status the user can use Devices Configuration
import file.
8.3
Modbus Exception Codes
The following exception codes are supported.
Table 16: Exception codes
Exception code
Meaning
0x01 ILLEGAL_FUNCTION
No request bytes present.
Read request for “Number of Neighbors” register for sub-de-
vice in simplified mapping.
0x02 ILLEGAL_DATA_ADDRESS
Starting address does not exist in mapping.
0x03 ILLEGAL_DATA_VALUE
Starting register valid, but length of requests spans at least
one unmapped register.
Summary of Contents for AWIN GW100
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