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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...

hi all I know plc 5 inherited octal system from plc 2. But why was octal addressing used in the first place? why not decimal or hexadecimal? plc-5 internally only understands binary and other codes are for us humans… Does anybody know internals of plc 5- is it 8 bit on 8 bit bus but addressing...

hi All I have kepserverEx configured to connect to the plc but there is no physical connection there yet. Is there any way to simulate the communication as healthy so i dont get plenty of messages in the scada "Error_configuration" ? I tried to use the option "Operating Mode\Simulated" set to...

hi All I am completely green in Mitsubishi PLC (i used to program siemens) but need kepware to connect to FX3U pls with ENET adp module. Could somebody pls help me with the very basics as kepware does not talk to the FX3U yet: What software do i need to read configuration/potentially do...

hi I would like to kindly ask you about fundamental concept: In control automation can database be event driven or only polled? For example when we have scada which reads data from MES or ERP system inside mssql server can this database somehow notify scada that there is new data to be queried...

Hi All I am rather green in SAN topic which is huge (i did do some short introduction to SAN course). Lets assume you need to configure SAN (storage area network) for the history records of the SCADA. 1 What things are critical to consider when designing SAN? performance, choice of iSCSI, FC...

I would like to deepen my knowledge on modbus so please answer the questions if you can: 1 Is it true that modbus ascii is addressable the values byte by byte - same as modbus RTU. This is different to modbus TCP which is addressing the values using 2 bytes? Is my understanding correct? 2 what...

hi 1 Can anybody explain me please how hardware handshake work in RS232? 2 I assume new laptop dont have this capability? - 3 if that's true the selection for hardware control as shown below is not valid and should not be even visible- is this correct? 4 if my laptop had true rs232 port it will...

Hi All Could anybody advise me please: 1 where to find standards for RS232 or RS485. 2 Also standards for like ISO95 or ISO 88 3 Where are normally RFCs documents for ethernet standards kept I am not confident if there is one place of truth and reliable source for these standards? Regards

hi All I am trying to organize my understanding and improve knowledge about industrial networks. Can you please correct or comment my understanding about types of communication networks? 1 Producer - Consumer type of networks eg. Can bus 2 Source - Destination type of networks eg. Ethernet 3...

hi I wonder if you could suggest what is your preferred software/hardware for industrial communication (understood in broad way) analysis. Please correct me if i am wrong. The way i understand it: Each industrial communication has got some underlaying physical layer. For high level ethernet...