Seneca KEY-C Series User Manual page 16

SIMPLIFIED TAG DIAGNOSTICS
Tag diagnostics is only available in Modbus TAGs Gateway mode.
Tag diagnostics can also be viewed via the Modbus serial and Ethernet ports: via special Modbus registers.
The first Modbus address, from which the simplified diagnostics starts, is by default 49001 (Holding Register
9000).
Each bit represents a tag with the following meaning:
1 = TAG OK
0 = TAG FAIL
The least significant bit is the status of tag no. 1
The next is the status of tag no. 2 and so on ...
For example the reading of the following registers:
49001 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1
49002 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1
Means: TAG 1, TAG 4, TAG17, TAG 18 , TAG 19, TAG 20 OK, all the others in FAIL.
At the start, all tags are in a fail state (all 0).
EXTENDED TAG DIAGNOSTICS
Tag diagnostics is only available in Modbus TAGs Gateway mode.
When a tag is in an error state it is possible to get more information using extended diagnostics.
Extended diagnostics reserves 1 byte for each tag (since the limit is 500 tags, there are 500 bytes = 250 Modbus
registers for extended diagnostics).
This diagnostics is found at the end of the simplified diagnostics (default starting Modbus address is 49033,
Holding register 32).
Each Modbus register contains 2 tags, so for example:
49033 TAG02_TAG01
49034 TAG04_TAG03
...
49282 TAG500_TAG499
49283 LAST_LOOP_TIME_COM1
49284 LAST_LOOP_TIME_COM2
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MODBUS TO CLOUD
"KEY-C" GATEWAYS
MI00725-1-EN
Page 16