Lika EM58 MB, User Manual

Page: 63 / 92

ES58 • EM58 MODBUS®
Starting address Hi 00 Starting address Hi 00
Starting address Lo 00 Starting address Lo 00
Quantity of registers Hi 00 Quantity of registers Hi 00
Quantity of registers Lo 04 Quantity of registers Lo 04
Byte count 08
Register 1 value Hi 00
Register 1 value Lo 00
Register 2 value Hi 08
Register 2 value Lo
00
Register 3 value Hi 00
Register 3 value Lo 80
Register 4 value Hi 00
Register 4 value Lo 00
As you can see in the table, the values 00 00 hex and 08 00 hex, i.e. 2048 in
decimal notation, are set respectively in the registers 1 and 2 of the
Custom
counts per revolution [0000-0001 hex]
parameter; while the values 00 80
hex and 00 00 hex, i.e. 8388608 in decimal notation, are set respectively in the
registers 3 and 4 of the
Custom total resolution [0002-0003 hex]
parameter.
Thus the encoder will be programmed to have a 2048-count-per-revolution
single-turn resolution and a 4096-turn multi-turn resolution (8 388 608/2048).
The full frame needed for the request to write the value 2048 dec next to the
Custom counts per revolution [0000-0001 hex]
parameter(registers 1 and 2)
and the value 8388608 dec next to the
Custom total resolution [0002-0003
hex]
parameter(registers 3 and 4) to the Slave having the node address 1 is as
follows:
Request PDU
(in hexadecimal format)
[01][10][00][00][00][04][08][00][00][08][00][00][80][00][00][B6][DA]
where:
[01] = Slave address
[10] =
16 Write Multiple Registers function code
[00][00] = starting address (
Custom counts per revolution [0000-0001 hex]
parameter, register 1)
MAN ESx58x_EMx58x MB E 1.3 MODBUS® interface 63 of 92