Modbus RTU Interface Module for SED2
Technical Instructions
Document Number 155-767
February 25, 2009
Siemens Industry, Inc.
Page 9
Verifying the
Installation
After all necessary connections have been made, power up the SED2 and the
Interface Module. Wait approximately five seconds.
NOTE:
If the Interface Module has been installed correctly, the STAT LED will
be flashing green, and the LCL LED will be alternating so fast between
red and green that it will appear to be glowing amber.
Modbus Interface
Module with
Network as
Command Sourc
e
If not using the Modbus for commands, do not change P0700[0] and P1000[0].
Instead, verify communications by issuing a start command (from the source) and
checking the feedback on the Modbus master device to ensure that it reads proper
values in the appropriate Registers.
Modbus Interface
Module with
Network as
Command Source
1. To verify that the Interface Module and SED2 are set up correctly, set P0700[0]
and P1000[0] to a value of
5
so that the SED2 can be controlled from the
Interface Module network.
2. From the Interface Module host, issue an Interface Module write, with of a value
of 8192 (2000h, or 50% of the maximum frequency) to the FREQ REF register
(40003 followed by a Modbus write with the value of 1 to the ENABLE register
(40004).
3. Write a value of 1 to the CMD START register to stop the drive again. The SED2
frequency can be changed at any time during this process by writing to the
FREQ REF register (40003).
