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1SI ASCII communication problems

Created by: JOSECARLOS at: 12/3/2009 4:59 PM (1 Replies)

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12/3/2009 4:59 PM	Rate (0)
JOSECARLOS Posts: 1 Rating: (0)	Hi, We have a MAXON modem connected to the 1SI ASCII module. We receive through that modem severalASCII frames. We want the 1SI module to send only one answer to each frame. We only manage to comunicate if we call the SEND and RECEIVE FB´s with no condition (continuous calling). By doing so, the problem is that we overload a communications driver in the receiving SCADA. We try it by using an edge calling for that FB´s but it didn´t worked at all. Thank you,
JOSECARLOS Posts: 1 Rating: (0)
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12/14/2009 2:45 PM	Rate (0)
little holmes Experienced Member Joined: 12/9/2009 Last visit: 4/5/2022 Posts: 156 Rating: (11)	Hello, in the manual "SIMATIC ET 200S Serial interface modules" do you find more information about the communication blocks FB3 "S_SEND" and FB2 "S_RCV" http://support.automation.siemens.com/WW/view/en/9260793 When the valueof the input parameter "R"onFB3 "S_SEND"is "1"thensending is disabled. Whenthe value of the input parameters "R" = 1 and/or "EN_R" = 0onFB2 "S_RCV"then receiving is disabled. Normaly with positive edge on input parameter "REQ" the send and receive job should be started. Best Regards and good luck

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