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MB_SLAVE responds with incorrect characters

Created by: eScardigno at: 7/2/2010 4:18 PM (2 Replies)

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7/2/2010 4:18 PM	Rate (0)
eScardigno Member Joined: 7/2/2010 Last visit: 5/28/2024 Posts: 2 Rating: (0)	I have CPU 1212c with a CM1241-RS232. Ideveloped a Function Block where MB_SLAVE function is called to respond to a Modbus master. The function works correctly. If however 'call other function block, the MB_SLAVE responds with incorrect characters. All functions are implemented by the same OB called cyclic. Has anyone had a similar problem? Splitted from MODBUS w/S7-1200.
	Last edited by: O_Moderator at: 7/5/2010 9:30 AM new subject after spliting
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7/23/2010 9:55 PM	Rate (0)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 11/1/2024 Posts: 4351 Rating: (1451)	Hi, What you mean with "If however 'call other function block, the MB_SLAVE responds with incorrect characters"?
	Denilson Pegaia Siemens Industry Sector Technical Support
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7/27/2010 3:55 PM	Rate (0)
hbrianjr Posts: 13 Rating: (4)	Hello, This was a problem that wasfixed in STEP7 BASIC SP2 Check the version of your MB_SLAVE block in the MODBUS library. It shoud be v1.1. Service Pack for STEP7 BASIC (SP2) http://support.automation.siemens.com/WW/view/en/39741113 Download and install the SP2 (you should delete the original MB_SLAVE block and get the new block from the library into your code.) Good Luck
hbrianjr Posts: 13 Rating: (4)	Last edited by: hbrianjr at: 7/27/2010 3:57 PM
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