Multi function meter looping
we have to design system for Energy monitoring system.
We have 70 Multifunction meter in a different-different location we have to take data over SCADA ,and all multifunction meter are equiped with modbus RTU(RS-485) protocol.
we have to take data over the SCADA through PLC AC500
distance between one meter to another is approx 90 meter.
my question is
1-how many meters will be looped in a single loop
2-is required PLC for every loop or we can use one plc for all meters
Voted best answer
Theoritically for modbus you can connect upto 250 slave devices that also depends on the typeof master (PLC) that you have selected. This answers your first question.
2nd is with modbus you can go upto 1.2kms of length (single Loop). Beyond this their will be the voltage drop in the signal srength.
I hope this is usefull to you.
You can use MODBUS RTU to MODBUS TCP/IP converter. Refer my attachment.
Kindly consider following things:
1.Distance: max 1000 meters
3.Baudrate : selection based up on distance .for 1000 meter 9.6kbps.
4.Number of slaves : 32
kindly seperate power cable and communication cable.