We have a V130 which we want to use as a slave on a Scada system. When I read about slave adressing in the help file the pointer value offset is given for each data type, no problems. However, when I read the examples (and also different topics regarding modbus here on the forum) another offset seem to occur. For example when writing a 3-bit vector of outputs starting at O8:
I'm trying to establish communication with the V130 trough a ModBus simulator on a PC, often enough I can get a connection but I haven't been able to read or write anything to the PLC. I've tried several softwares and all of them has a field "Slave ID: ". Is this the ID filled in the Modbus config FB? I.e 255?
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I have a Comtrol RocketPort Express PCIe card installed on the host machine and have configured this for 'passthrough' to my VM. This card provides 32 physical serial communication ports. Within my VM I am using Calta Modbus simulator to run comms loop tests. I have he following connected up:
Modbus Poll is a Modbus master simulator designed primarily to help developers of Modbus slave devices or others that want to test and simulate the Modbus protocol. With the multiple document interface you can monitor several Modbus slaves and/or data areas at the same time. For each window you simply specify the Modbus slave ID, function, address, size and poll rate. You can read and write registers and coils from any window. If you want to change a single register, simply double click the value. Or you can change multiple registers/coils. Multiple data formats such as float, double and long with word order swapping are available.
Anyone know how the addressing works in control expert for READ_VAR (control expert 14)? If this was all serial, I could just use the Modbus address. For all ethernet I would just use the IP. If I use the IP of the gateway, how does it know which of the slave device I am trying to read from? If I use the modbus addresses of the device, how does the PLC know where to find the gateway? be457b7860
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