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hi Siemens does not sell power meters covering that range. PAC3220 can only do typical range 40-60hz The voltage is coming from the transformer which is stepped down by the voltage transfomer to 400V. Transformer is fed by the VFD with the sine filter so the measured voltage is sine rather than...

hi All Fundamental question so please bear with me. I understand the concept of Siemens Wincc HMI tag as a memory structure to hold many properties related to the tag so tag it is really "structure of structures" to contain all these details which is much more than just address to store the raw...

hi All Might sound ridiculous but please bear with me. I heard that apple computers can run windows virtual machines much faster that standard PCs and some people use it in automatin. I would like to verify that claim: has anybody from this forum used macbook pro (what model was it) with...

hi All Any chance somebody explains me why real numbers are not used in VFD drives speed reference etc? So instead of sending sending 90.9 percentage of speed i would have to multiple it by 10 and send 909 which is then converted by the drive itself? Why floating point arithmetic in not used in...

I feel like i am asking very wide question but it will be beneficial for many people to organise this huge chunk of automation knowledge. When answering this question can you please consider 3 scenarios: A PLC brand e-g. Siemens, Mitsubishi, Allen Bradley, Beckhoff, others B Ways to extract...

hi Do you know which PLCs support MQTT? What can be done if they dont support MQTT - would kepware with Direct Drivers be the only option for the 4.0 connectivity? Regards

Hi I am trying to structure my understanding. As i know OPC DA servers sometimes allow tag browsing but siemens does not allow this - experience with siemens sinumerik opc machineswitch on CNC. I dont think s7300 allow tag browsing as well. What about other siemens devices like 1200 plc and...

can you help me with some basics which i thought understood: 1- when server is connected to the plc but no client used is there any data being fetched from plc at all? or there must be at leat 1 client with at at leat one group and 1 item? so when client disconnects plc gets no traffic? 2- is...

Just wonder if all scada systems are OPC UA based to provide the access to the tags? In particular i would like to compare: 1 - rockwell factory talk site edition 2 - citec scada 3 - iconics 4 - intouch 6 - ignition - this is OPC UA for sure 7 - wincc How did tag servers work in the past ? was...

Hi I wonder how you would go about troubleshooting OPC DA comms between 2 computers on the same network (obviously 1 being server and the other client). The only thing know is that the ping is working between both PCs. What is the best path and the least amount of steps ? i have a feeling it...