Lenze SCF Series Drives Modbus Communications - Manual (Page 29)

25 RG-SFMOD
Drive Control & Communication
7 Quick Start Instructions
Follow these Quick Start instructions to use ModBus Communications for basic network control of an SCF
drive. These instructions are a reprint of Application Note AN0028,
Basic Network Control of the SCF Drive
using Modbus™ Communications. To download the SCF product manual or application note visit the AC
Tech Technical Library at http://www.lenze-actech.com.
7.1 Initial Settings
1. Set Parameter 14 (P14) to 01 to enable serial communication.
2. Set P43 to the desired network address that the Modbus master will poll. Valid Modbus addresses are
1-247.
TIP - Avoid using address 1. Most Modbus devices ship with a default address of 1. Duplicate addressing
on a Modbus network is not allowed. It can lead to conflicts when replacing and commissioning nodes.
To avoid this, do not to set the slave address to 1.
3. Set the Modbus master to 9600 baud. No other baud rates are supported by the SCF drive.
4. The SCF series drive has the provision for a watchdog timer to monitor network communications to the
drive. The timer is hard coded to a value of 10 seconds. If the drive is under network control and the
master does not communicate with the SCF drive for longer than the 10 second timeout period, the
drive will STOP. The timer can either be enabled or disabled as outlined in the next step:
5. The drive needs to have its network data formatting set the same as the Modbus master.
a. If the Modbus master is set to use 8 data bits, no parity and two stop bits and you want the
watchdog timer on the SCF drive ENABLED, set P15 to 02.
b. If the Modbus master is set to use 8 data bits, no parity and two stop bits and you want the
watchdog timer on the SCF drive DISABLED, set P15 to 03.
c. If the Modbus master is set to use 8 data bits, even parity and one stop bit and you want the
watchdog timer on the SCF drive ENABLED, set P15 to 04.
d. If the Modbus master is set to use 8 data bits, even parity and one stop bit and you want the
watchdog timer on the SCF drive DISABLED, set P15 to 05.
e. If the Modbus master is set to use 8 data bits, odd parity and one stop bit and you want the
watchdog timer on the SCF drive ENABLED, set P15 to 06.
f. If the Modbus master is set to use 8 data bits, odd parity and one stop bit and you want the
watchdog timer on the SCF drive DISABLED, set P15 to 07.