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Distance between HMI and CPU controller

6/3/2014 10:38 AM	Rate (0)
asd125 Posts: 11 Rating: (0)	Dear all, I would like to know the allowable distance (maximum distance) between the HMI (operator station) and CPU controller, for example 20 meter, dose it will affect our normal process such as delaying in response? Best regards,
asd125 Posts: 11 Rating: (0)
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6/3/2014 10:52 AM	Rate (0)
Madhava Silver Member Joined: 11/26/2011 Last visit: 3/3/2025 Posts: 508 Rating: (23)	aasim Dear all, I would like to know the allowable distance (maximum distance) between the HMI (operator station) and CPU controller, for example 20 meter, dose it will affect our normal process such as delaying in response? Best regards, It mainly depends upon the communication medium / protocol and depends on the selection of HMI and CPU too. You have asked a generous question which can't be answer on one line.

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6/3/2014 11:08 AM	Rate (0)
H-H Platinum Member Joined: 7/2/2008 Last visit: 3/19/2025 Posts: 928 Rating: (309)	Helloaasim, I agree withMadhavaas this is a bit generic question. However and since you are asking in Siemens forum, I'll assume 2 major possibilities, 1- Having copper RS485 network (Maybe MPI or Profibus) then the maximum length would depend on the cable and baud rate. Please check pages (42-46) in theProfibus network manual. For a 20 meters, it should be OK for all baud rates (i.e. up to 12 Mbps). 2- Having copper Industrial Ethernet network then the maximum distance would depend on your cable type. Most of cables will support longer than 75 meters. More info can be read in Industrial Ethernet Industrial Ethernet / PROFINET Industrial Ethernet System Manual Once again, you will get more accurate answer when you provide more details. Best regards, H-H

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6/3/2014 11:10 AM	Rate (0)
S7 AUTOMAN Posts: 515 Rating: (56)	aasim Dear all, I would like to know the allowable distance (maximum distance) between the HMI (operator station) and CPU controller, for example 20 meter, dose it will affect our normal process such as delaying in response? Best regards, this is a reported problem, which you mal look into SCADA PC to PLC communication By using Ethernet cable CAT-6 For the recommended distances, see the attached file which is an extract from siemens manual Attachment Comparison of Communication Media.pdf (140 Downloads)
S7 AUTOMAN Posts: 515 Rating: (56)
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