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ni.com is currently experiencing issues.
Support teams are actively working on the resolution.
02-09-2010 08:32 AM
Is there an option available in the Modicon Object to enable an address shift during communication with Modicon Devices. When communicating with a Modicon Quantum PLC 400010 will return the value from the device in reg 400010 but when communication with a Modicon M340, Premium and others 400010 will return the value in 400009.
02-10-2010 01:02 AM
We don't have such an option to shift the address.
The register address starts from 400001. What if you read address 400001 from Lookout?
02-10-2010 07:44 AM
400001 will return 400000. Some Modbus devices are 0 based (Quantum) and others are 1 based (Premium, M340). We can change the alias address to reflect the offset but I was looking for something simple.
05-01-2013 07:10 PM
05-07-2013 10:55 AM
Nothing a little data member export and import cant fix...
On the standard Koyo (automationdirect) PLCs we have to convert from Octal to decimal, then add 1.
For example:
PLC: V1200
Decimal: 640
MODBUS: 40641
05-09-2013 11:40 AM
06-01-2024 12:25 PM
Just found this forum recently.
Upgrading from TSX Compact to M340. The code in the TSX uses memory bit %M to send data to SCADA. The existing SCADA uses 40000x addressing, somehow there is a correlation between %M and 40000x which I don't understand. I've replicated the %M address into the new M340 and used the existing addressing in the CitectSCADA, however does not work. There seem to be offset can figure out, even tried to offset by 1 in the PLC.
1. Do you just enter %SW139 and %SW141 in the data editor only or need to add it in the logic?
2. Do you know if there is a direct correlation between %M and modbus 40000x addressing? Does %M1 = 400001, or can %M1 = 401013.1 so on?
Need help I am totally lost and stuck on this problem.