4�5�- Modbus Communications - Circutor CVM-NET4+-MC Instruction Manual

CVM-NET4+-MC
4�5�- MODBUS COMMUNICATIONS
One or several CVM-NET4+-MC analyzers can be connected to a computer or PLC. This system makes
it possible to centralise the data in a single record point, in addition to the normal operation of each of
them (PowerStudio® System).
The CVM-NET4+-MC has an RS-485 serial communication output. If more than one device is con-
nected to a serial communication bus (RS-485), each analyzer must be assigned a peripheral number
or address (from 01 to 255), with a maximum of 32 units per communication bus, so that the central
computer can send the queries from the various records measured or calculated to these addresses.
The CVM-NET4+-MC analyzer communicates using the MODBUS RTU© protocol (Pulling Question /
Answer).
Instruction Manual
RS-232
USB
Ethernet
Profibus
...
D
01
V V V V
L1 L2 L3 N
Power Supply
DIGITAL OUTPUTS
Channel 1 Channel 2 Channel 3
1 2 3 C 1 2 3 C 1 2 3
S1 S1 S1 S2 S1 S1 S1 S2 S1 S1 S1
Figure 6:RS-485 Connection
PC
RS-232 / USB / Ethernet / Profibus ...
RS-485
RS-485
S(GND)
B(-) A(+)
D D D D B S A
02 03 04 D0
COM RS485
CPU
COMM
RESET
Channel 4
C 1 2 3 C
S2 S1 S1 S1 S2
21