Siemens SINAMICS V90 - Cyclic Communication

Task navigation
SINAMICS V-ASSISTANT Online Help
Operating Manual, 04/2017, A5E36618042-003
139
Modbus register
number
Description
Modbus
access
Unit
Scaling factor
Range or
On/Off text
Data/parameter
40966/40967 Numerator of electronic
gear 2
R/W - 1 1 to 10000 p29012[2]
40968/40969 Numerator of electronic
gear 3
R/W - 1 1 to 10000 p29012[3]
40970/40971 Denominator of the
electronic gear
R/W - 1 1 to 10000 p29013
Parameter scaling
Due to the limits of the integer data in the Modbus protocol, it is necessary to convert the
drive parameters before transmitting them. This is done by scaling, so that a parameter,
which has a position after decimal point, is multiplied by a factor, to get rid of the fractional
part. The scaling factor is as defined in the above table.
4.6.2.1
Cyclic communication
Operating steps
1.
Set the drive to servo off status.
2.
Go to "View all parameters" panel and set the related parameters.
•
Configure the RS485 bus address by parameter p29004.
– You can configure the slaver address from 1 to 31.
•
Set the communication protocol by parameter p29007.
– Set p29007 = 2 to use the Modbus protocol.
•
Select the Modbus control source by parameter p29008.
– p29008 = 1: Setpoint and control word from Modbus PZD
– p29008 = 2: No control word.
•
Set the transmission baud rate by parameter p29009.
•
Set the monitor time for Modbus by parameter p29019.
Sets the monitoring time to monitor the process data received via the RS485
interface. If no process data is received within this time, then F1910 is output.
The default vaule of p29019 is 0. If p29019 = 0, monitoring is deactivated.
3.
Select the control mode for the drive on the following panel:
4.
Save the parameters and restart the drive.