Communication Guide, ©ComAp – March 2014 115
IGS-NT Communication Guide 03-2014.pdf
Alarm list reading
It is not possible to read alarm list simultaneously from more terminals. If the terminal starts reading,
the reading is locked for other terminals. It is unlocked 5 seconds after last reading of alarm list. The
locked terminal indicates to another terminal an error message.
The whole alarm list is stored in the cache memory at the moment of locking and the following reading
of records is performed from this memory. Locking is done only while reading the first record. So the
successive reading from the first to the last record is supposed.
Alarm list reading via Modbus
Since firmware version 2.5 and higher is possible to read alarm list via modbus as a binary attributes
of protection states. For this function was reserved these ranges of registers.
Number of register of particular protection you can get as exporting of modbus registers list from
GenConfig. Open an archive in GenConfig (ver. 2.5 and higher), open File menu and choose
“Generate Cfg Image --> Modbus registers all” (see “How get numbers of ModBus communication
objects” chapter). Open the list of modbus registers you have got and see registers with number
according the table. Here you can see meaning of particular modbus registers. Each register carries
informations about two protections (Protection#1 and Protection#2).
Register Protection#2 Protection#1
=============================================================================
45754 Warning 7 Warning 8
45755 Warning 9 Warning 10
45756 SD 11 SD 12
45863 Oil press Water temp
45864 Fuel level N/A
45925 BIN 1 BIN 2
45926 BIN 3 BIN 4
EXAMPLE OF MEANING OF MODBUS REGISTERS
Meaning of register content
Register map:
Bit 0-7 ................. Protection #1
Bit 8-15 ............... Protection #2
Bit 0-2 ................. Protection #1 Level 1
Value Meaning
------------------------------------------------------------------
0 Level 1 inactive
2 Level 1 active, confirmed
3 Level 1 active, blocked
4 Level 1 previously active, not confirmed yet
6 Level 1 active, not confirmed yet
7 Level 1 active, not confirmed yet, blocked
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