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| 4/20/2013 11:58 AM | |
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Posts: 49 Rating:
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Dear all I want communicate s7-200 with 7 segment display module with RS485 port,7 segment module receive data in ascii format, i tried communicate through modbus rtu but communication not extablis. It is possible to communicate with 7segment display module through modbus rtu,attach my plc programme. Thanks all Attachmentmodbus communication.zip (216 Downloads) |
| 4/20/2013 3:22 PM | |
Joined: 9/27/2006 Last visit: 3/23/2025 Posts: 12344 Rating:
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Hello rabi; Unless the documentation of your 7-segment module specifically states Modbus ASCII as an acceptable protocol, you can surmise that this protocol is not supported, and Modbus blocks of the S7-200 libraries cannot be used. My experience with 7-segment displays is limited, but all the ones I worked with used starignt ASCII transmissions when connected to a controller. The S7-200 supports ASCII comms through "Freeport" programming, and information (along with sample programs) can be found in the Communication section of the S7-200 Tips and Tricks. Look in the following discussion to find a link to download the Tips and Tricks on your PC: Freeport mode ASCII communication procedure & program in S7-200 |
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