Lenze MC Series Drives - Manual (Page 32)

RG-MCMOD 28
Drive Control & Communication
7 Quick Start Instructions
Follow these Quick Start instructions to use ModBus Communications for basic network control of an MC
drive. These instructions are a reprint of Application Note AN0035,
Basic Network Control of the MC Drive
using Modbus™ Communications. To download the MC product manual or application note visit the AC
Tech Technical Library at http://www.lenze-actech.com.
7.1 Initial Settings
1. Set the Modbus Master to 9600 bps with 8 data bits, no parity and 2 stop bits. The MC1000/3000
series drives do NOT support any other baud rates or data formats.
2. Set Parameter 58 (ADDRESS) 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. As duplicate
addressing on a Modbus network is not allowed, this can lead to conflicts when replacing and
commissioning nodes. To avoid this it is recommended that you do not set the slave address to 1.
3. The MC1000/3000 series drive has the provision for a watchdog timer to monitor network
communications to the drive. The timer is fixed at a value of 10 seconds. If the drive is under network
control and the master does not communicate with the MC1000/3000 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.
4. Set Parameter 57 (SERIAL) to either W/TIMER or W/O TIMR as desired in order for serial communication
to function.
7.2 Drive Control
1. Start/Stop Control: Please be advised that while the drive is under network control the local STOP
circuit is always enabled. The drive’s control registers (i.e. start, auto/manual, direction) cannot be
written to unless the drive is operating in LOCAL control mode. If Parameter 29 (CONTROL) is set to
REMOTE or if it is set to BOTH and no LOC SEL terminal is asserted, the network cannot control the
drive. Drive parameters can still be written.
Also, if Parameter 29 (CONTROL) is set to BOTH and a LOC SEL terminal is asserted the drive can only
be started over the network if the TB1 input is also asserted. If TB1 is not to be used as an external stop
contact, simply jumper the TB1 input to TB2.
If Parameter 29 (CONTROL) is set LOCAL, the TB1 input does not need to be asserted for the drive to
be started over the network.
2. Use either Modbus function code 16 with a length of 1 or Modbus function code 06 to perform any
writes to the drive.