B-26 W650 Wind Generator Protection System GEK-113032A
B.6 EVENTS STATUS REQUEST (ALARMS) APPENDIX B
B
B.6.6 USER MAP
W650 units incorporate a powerful feature called ModBus User Map, that allows to read 256 non-consecutive data records
(settings and statuses). It is often required for a master computer to interrogate continuously several connected slave
relays. If those values are dispersed along the memory map, reading them may require several transmissions, and this
may cause a communications overload. The User Map can be programmed to get several memory addresses together in a
block of consecutive addresses of the User Map, so that they can be accessible with a single reading operation.
The user Map has two sections:
A record index area (addresses 0x3384 to 0x3483), containing 256 statuses and/or setting record addresses.
A record area (addresses 0xF330 to 0xF42F), containing the values for addresses indicated in the index area.
Data records that are separated in the rest of the memory map can be remapped to an address of an adjacent record in the
User Map area. For programming the map this way, addresses for the required records must be written in the index area.
This avoids the need for several reading operations, thus improving data transmission yield.
For instance, if Contact Outputs from Board F (address 0x008B) and Board G (address 0x00B0) values are required, these
addresses must be mapped as follows:
In address 0x3384, write 0x008B.
In address 0x3385
XXX write 0x00B0.
The reading of records 0xF330 and 0xF331, applying the corresponding bit masks, will provide the required information
about the two boards Contact Outputs.
NOTE: Only single data can be set in the map, data that are in the memory map and can be read. This feature is not valid
for events, waveform records, etc. that are not located in a map address.
To Next Page
Loading...
