10/17/2019 12:41 PM | |
Joined: 9/16/2013 Last visit: 1/5/2024 Posts: 511 Rating: (106) |
Input registers or holding It shouldn't make much difference, take a look link and attached pic as well. https://support.industry.siemens.com/cs/ww/en/view/100633819 |
Last edited by: SOble at: 10/17/2019 12:43:46Last edited by: SOble at: 10/17/2019 12:46:09Last edited by: Jen_Moderator at: 10/17/2019 14:20:26Optimized link. Website: |
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10/19/2019 2:14 AM | |
Joined: 3/28/2010 Last visit: 9/21/2024 Posts: 1056 Rating: (213) |
If your Modbus slave PLC is providing data from register (4)000001, then the Modbus Master (DCS) is using Function Code 03 to read that register because FC 03 is 'Read Holding Register' and the memory area associated with Holding Registers is identified with the leading numeral (4). Or is the DCS side saying they are incapable of reading a Holding Register? |
10/19/2019 9:30 AM | |
Posts: 110 Rating: (0) |
Hi, I checked with the modscan tool to determine where the data is mapped in the slave PLC...I have checked both holding register as well as input register and identified the datas are mapped in input register...We have no access to check the DCS configuration also site engineer have limited access to DCS.. We just need map S71200 to the same address so that DCS will accept the data from S71200. I have downloaded and installed TIA Portal V13 with firmwarev4.3 and need to try all this Regards Sandy |
10/19/2019 8:39 PM | |
Joined: 3/28/2010 Last visit: 9/21/2024 Posts: 1056 Rating: (213) |
>"Checked it with Modscan" That was a good idea, then you know for sure. Please let us know if the firmware/software updates enable you to create Input Registers. |
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