                                                                                  | |
Contents
| 
WAGO-I/O-SYSTEM 750 Commissioning 59750-652 Serial Interface RS-232 / RS-485Manual1.2.08.3.7 Data Exchange Operating Mode Application ExampleIn the "Data Exchange" operating mode, the I/O module monitors process dataexchange with the partner module. If the connection is interrupted for 200 ms ormore, it generates a diagnosis in the status byte. This monitoring only takes intoaccount if there is a connection between the I/O modules. As the user, you maywant to check if the application that accesses the fieldbus node of the oppositeside as a PLC application or via fieldbus has received the information sent.You can easily implement this monitoring by reserving three bits in the data partof the process image for transmission of status information. Use bits 0, 1 and 2 ofthe first data byte, for example.Use bit 0 as the "ON" signal on both sides.1. Describe bit 0 in the process image (output) permanently with status 1.2. Check if the "ON" signal is displayed correctly in the process image (input).• If the status is 0, there is no connection with the opposite side and all databytes of the process image (input) of the I/O module are invalid.Use bit 1 as the "toggle" bit to send data to the opposite side.3. Invert the sent "toggle" bit if you want to send new data.If you have already sent data, you can only send new data if the opposite hasacknowledged receipt.Use bit 2 as the "acknowledge" bit on both sides to signal data receipt to therespective opposite side.4. Always invert the sent "acknowledge" bit if the received "toggle" bit haschanged.Pos : 83 /D okumentation allgemei n/Glieder ungs elemente/---Seitenwechs el--- @ 3\mod_1221108045078_0.doc x @ 21810 @ @ 1 |
Related manuals for WAGO 750 Series
This manual is suitable for:
manualsdatabase
Your AI-powered manual search engine