SMAR LC700 - Communication Channels

Modules And Accessories
3.27
CABLES
One Wire 14 AWG (2 mm
2
)
Two Wires 20 AWG (0.5 mm
2
)
NOTE
To increase service of life of your relays and to protect your modules from reverse voltage damages, externally
connect a clamping diode in parallel with each inductive DC load or externally connect an RC snubber circuit in
parallel with each inductive AC load.
9 B
10 B
-
+
AC Load
D
C
Load
9 B
10 B
RC
N
L
Communication Channels
The CPU-700 has three communication channels that supply the user with 3 independent channels
(ports) identified as P1 (EIA-232), P2 (EIA-485) and P3 (EIA-485).
The three channels may be used at the same time with the following features:
- P1 (EIA-232-C) is for programming and monitoring, point-to-point short connections.
- P2 (EIA-485) is for programming and monitoring, point-to-point or multi drop in long industrial
connections.
- P3 can mimic P2 or act as a Master channel for a remote I/O connection Remote I/O interface
module (RIO-700-3). A rotary switch on the CPU Module card can set the P3 channel behavior.
- Any of the ports can be connected to the Smar ENET-700 (Ethernet-Serial) converter module.
In one Network it is possible to have up to 31 CPU-700 modules. For the correct communication,
each CPU-700 module must have an unique MODBUS ID (address) and a baudrate for P1
(Modbus) and other baudrate for P2 and P3 (Modbus). Modbus baudrates are configurable by
software throughout the use of CONF700.
Restrictions:
o Only one channel can be used at the same time to monitor the network through the
CONF700. Other channels will be locked after the first one begins.
o All channels are referred with the same address.
o Channels P2 and P3 shares the same baud rate. P1 has a dedicated one.