FP2 Serial Data UnitTable of Contents
ii
Chapter 4 Communication with External Devices
4.1 Overview of Communication with External Devices 4 − 3....................
4.1.1 Sending Data to External Devices 4 − 3...........................
4.1.2 Receiving Data from External Device 4 − 5.........................
4.2 Programming When Data is Sent 4 − 7....................................
4.2.1 How Timings and Flags (Contacts) Work 4 − 7.....................
4.3 Programming When Data is Received 4 − 10..............................
4.3.1 How Timings and Flags (Contacts) Work 4 − 10...................
4.4 Sample Program 4 − 14................................................
4.4.1 Sample Program <FP series PLC (MEWNETCOL−COM)> 4 − 14....
4.5 Data Sent and Received with the Serial Data Unit 4 − 20...................
Chapter 5 Precautions Regarding Serial Data Unit Operation
and Programs
5.1 Precautions Regarding Basic Operation of the Unit 5 − 3....................
5.1.1 Shared Memory Values When the Power Supply is Off 5 − 3.........
5.2 Precautions Concerning Communication 5 − 4.............................
5.2.1 Precautions When a Start Code is Valid 5 − 4......................
5.2.2 End Codes for Communication 5 − 5..............................
5.2.3 Operation If a Communication Error Occurs 5 − 5...................
5.2.4 Precautions Concerning a Software Reset 5 − 6....................
5.2.5 Precautions When Setting the Control Signals
CS and CD to “Valid” 5 − 6.......................................
Chapter 6 Operation If an Error Occurs
6.1 Operation If an Error Occurs 6 − 3........................................
6.1.1 If the ALARM LED on the Serial Data Unit Lights 6 − 3..............
6.1.2 When the Serial Data Unit ERROR LED Lights 6 − 4................
6.2 What To Do If An Error Occurs 6 − 5......................................
6.2.1 If the ALARM LED Lights on the Serial Data Unit 6 − 5..............
6.2.2 If the ERROR LED on the Serial Data Unit Lights 6 − 5..............
6.2.3 If Data cannot be Sent or Received with the Serial Data Unit 6 − 6....
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