The complete description of Modbus communication protocol can be found in
Modbus Protocol
Reference Guide PI-MBUS-300
and Open Modbus Specification Release 1.0. Both documents are
available from web site at
http://www.modicon.com/openmbus/ .
Communication object vs. Register
All the data intended for communication has its representation as communication objects in the
controller. The communication object is represented by the n-byte array in the controller memory and
identified by the unique 16-bit communication object number. The register, according to Modbus
communication protocol, represents a two-byte data and in communication functions is referenced by
16-bit register address. Further in the description of communication functions
the communication
object number will always be used as a register address
and length of the communication object
will be expressed by number of registers.
Just one communication object can be read or written
by one communication function.
Hint:
To obtain communication object numbers it is possible to download the Actual IL controller description
on-line from controller or from (ail) archive and use “export data” function from LiteEdit software.
Communication object list (exported from default archive)
Setpoints (MRS10/11/15/16):
Name Firmware ver. Application Date App. ver. Ser. num. Filename
InteliLite IL-2.1
R:10.11.2004
MRS16 30.11.2004 2,1 0200FFFF MRS16-
2.1.ail
Group Name Value Dimension Password Com. obj. Low limit High
limit
Data type
Basic settings Gen-set name InteliLite No 8637 Short string
Basic settings Nomin power 200 kW No 8276 1 4000 Unsigned
16
Basic settings Nomin current 350 A No 8275 1 5000 Unsigned
16
Basic settings CT ratio 2000 /5A No 8274 1 5000 Unsigned
16
Basic settings PT ratio 1,0 /1 No 9579 0,1 500,0 Unsigned
16
Basic settings Nomin voltage 231 V No 8277 100 22000 Unsigned
16
Basic settings Nominal freq 50 Hz No 8278 45 65 Unsigned
16
Basic settings Gear teeth 120 No 8252 0 500 Unsigned
16
Basic settings Nominal RPM 1500 RPM No 8253 100 4000 Unsigned
16
Basic settings FltResGoToMAN DISABLED No 9983 String list
Basic settings DispBaklightTO 0 min No 10121 0 60 Unsigned 8
Basic settings ControllerMode OFF No 8315 String list
Basic settings RS232 mode STANDARD Yes 24522 String list
Basic settings NumberRings AA 3 Yes 24512 1 30 Unsigned 8
Engine params Starting RPM 25 % No 8254 5 50 Unsigned 8
Engine params Starting POil 4,5 Bar No 9681 -10,0 1000,0 Integer 16
Engine params Prestart time 2 s No 8394 0 600 Unsigned
16
InteliLite – MRS10/11/15/16, SW version 2.2, ©ComAp – November 2004 57
IL-MRS-2.2.pdf
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