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| 2/19/2014 11:57 AM | |
Joined: 9/23/2005 Last visit: 11/14/2024 Posts: 4352 Rating:
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Hi, Here there are some tips and tricks related to MODBUS RTU communication with S7-1500: References: Manual: http://support.automation.siemens.com/WW/view/en/59057093 Complete sample program: http://support.automation.siemens.com/BR/view/en/68202723 Requirements: To establish a MODBUS RTU communication it is necessary a High Feature Comunication Module, (not Basic ) HW configuration: Device View, Communication Module properties, Port Configuration, Protocol: set to MODBUS Programming: Blocks needed: As master: Modbus_Comm_Load / Modbus_Master As slave: Modbus_Comm_Load / Modbus_Slave Call: call both block unconditionally REQ: Modbus_Comm_Load: use first scan bit Modbus_Master: should be set (0->1) every time you need to execute a job. My tip: use a 1s clock for the first tests, it slow enough to be observed by eye. When functional, you can change it for a faster clock (e.g. 100ms). Modbus_Comm_Load parameters: e.g. follow the online help. MB_DB: should be connected to the variable MB_DB from the instance DB of the blocks Mode: Mode is not an external parameter but else an internal FB variable. It should be set to the operation mode (see online help; e.g. RS232=0, 485=4) before the call the Modbus_Comm_Load. Other communication parameters: MODBUS RTU uses 1 startbits, 8 databits, 1 Stopbit (up to now, not configurable). Here there is a very simple non tested sample program (the complete version is related above). AttachmentC:\Users\z0008iwv\Documents\Bluetooth Exchange Folder\S7-1500 Modubs RTU.zip (4621 Downloads) |
Last edited by: Pegaia at: 2/20/2014 11:14 AMLast edited by: Pegaia at: 2/19/2014 12:00 PMDenilson Pegaia |
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| 2/19/2014 5:56 PM | |
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Posts: 784 Rating:
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Hello Pegaia, Thank you very much. Best regards......... |
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| 2/20/2014 10:59 AM | |
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Joined: 9/23/2005 Last visit: 11/14/2024 Posts: 4352 Rating:
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Hi you are wellcome. it is a pleasure to help. |
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Denilson Pegaia |
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| 7/31/2014 11:01 AM | |
Joined: 9/1/2005 Last visit: 11/18/2024 Posts: 4113 Rating:
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My Forum is the place to personalize your profile, |
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| 8/27/2015 3:56 PM | |
Joined: 9/3/2014 Last visit: 3/13/2019 Posts: 4766 Rating:
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New question published by Raj Iyer is split to a separate thread with the subject Moving Master_Modbus FB 775 to another project. Best regards |
| 8/18/2016 7:20 PM | |
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Posts: 2 Rating:
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| 11/8/2016 7:50 PM | |
Joined: 8/21/2014 Last visit: 11/15/2024 Posts: 1024 Rating:
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New question published by thuan_hpc is split to a separate thread with the subject S7-1500 with temperature controller by485: communication error. Best regards |
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My Forum is the place to personalize your profile, |
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| 1/7/2017 11:55 AM | |
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Joined: 9/1/2005 Last visit: 11/18/2024 Posts: 4113 Rating:
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New question published by Emz is split to a separate thread with the subject communicating S7-1500 with Danfoss EKC. Best regards |
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| 2/21/2017 1:33 PM | |
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Joined: 9/3/2014 Last visit: 3/13/2019 Posts: 4766 Rating:
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New question published by Peter_Apstar is split to a separate thread with the subject Where do I find the parameters IB_Start / IB_Count / OB_Start / and OB_Count?. Best regards |
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