SMAR LC700 - Device Communication Baud Rate and Device Address

LC700 – User’s Guide
3.8
Restrictions:
- Only one channel can be used at the same time to monitor the network through the CONF700.
Other channels will be blocked after the first one begins.
- All channels are referred with the same address.
- Channel P2 and P3 share the same baud rate. P1 has dedicated one!
Device Communication Baud Rate and Device Address
The CPU Module has a mini slide type of switch (communication button) on the top grid of the
plastic module that can set these communication parameters to Default values. Default values are: 1
for the address (also known as the Modbus ID), 9600 for the baudrate, parity even with 1 stop bit.
Default values apply to all of the three channels P1, P2 and P3 (case it is in Modbus Mode!) when
the Communication Switch is toward the ‘Back-Plane’.
When the Communication Switch is pointing to the front panel of the Module, indicates that the
programmed communication parameters (in the memory) are going to be used instead of Default
values. Communication parameters can be changed any time using the CONF700 programming
software.
CPU-700-C3 as a Regular CPU
The CPU-700-C3 can work as a Regular CPU with 3 Modbus/RTU channels or as a Master CPU in
a Remote I/O (RIO) system where 2 channels (P1 and P2) will work as Modbus/RTU and P3 as a
remote master channel.
Regular CPU - Means that no Remote I/O unit is attached. This implies that P3 together with P1 and
P2 are available as MODBUS/RTU slave channels. Note that none of then can act as a MODBUS
MASTER channel!
P1, P2 and P3 are independents MODBUS RTU slave channels. They can all be used at the same
time! P1 is dedicated for a point-to-point connection, while P2 and P3 can be used in two different
networks (master-slave) to increase CPU accessibility via two Computers (Masters) or in a
redundant architecture where the user may swap between channels in a failure situation.
Configuration:
- Rotary switch must be in the number 8.
- One MODBUS ID for P1, P2 and P3 configurable by software (CONF700)
- P1 baud rate and P2/P3 baud rate configurable by software (CONF700).
- DIP switches are disregarded!