Siemens SIMATIC S7 System Manual page 11

9.3.3.3 MBUS_SLAVE instruction ..................................................................................................... 492
9.3.3.4 Modbus RTU slave execution error codes............................................................................ 493
9.3.4 Modbus RTU master example program................................................................................ 494
9.3.5 Modbus RTU advanced user information ............................................................................. 496
9.4 Open user communication library ......................................................................................... 498
9.4.1 Parameters common to the OUC library instructions ........................................................... 499
9.4.2 Open user communication library instructions ...................................................................... 501
9.4.2.1 TCP_CONNECT instruction .................................................................................................. 501
9.4.2.2 ISO_CONNECT instruction ................................................................................................... 504
9.4.2.3 UDP_CONNECT instruction ................................................................................................. 508
9.4.2.4 TCP_SEND instruction.......................................................................................................... 510
9.4.2.5 TCP_RECV instruction.......................................................................................................... 513
9.4.2.6 UDP_SEND instruction ......................................................................................................... 516
9.4.2.7 UDP_RECV instruction ......................................................................................................... 519
9.4.2.8 DISCONNECT instruction ..................................................................................................... 522
9.4.3 Open user communication library instruction error codes .................................................... 524
9.4.4 Open user communication library example .......................................................................... 525
9.4.4.1 Active partner (client) ............................................................................................................ 526
9.4.4.2 CheckErrors subroutine ........................................................................................................ 535
9.4.4.3 Active partner symbol table .................................................................................................. 536
9.4.4.4 Passive partner (server)........................................................................................................ 537
9.4.4.5 CheckErrors subroutine ........................................................................................................ 543
9.4.4.6 Passive partner symbol table ................................................................................................ 544
9.5 USS library ............................................................................................................................ 545
9.5.1 USS communication overview .............................................................................................. 545
9.5.1.1 USS protocol overview.......................................................................................................... 545
9.5.1.2 Requirements for using the USS protocol ............................................................................ 546
9.5.1.3 Calculating the time required for communicating with the drive ........................................... 547
9.5.2 USS program instructions ..................................................................................................... 548
9.5.2.1 Using the USS protocol instructions ..................................................................................... 548
9.5.2.2 USS_INIT instruction ............................................................................................................. 549
9.5.2.3 USS_CTRL instruction .......................................................................................................... 551
9.5.2.4 USS_RPM_x instruction ........................................................................................................ 554
9.5.2.5 USS_WPM_x instruction ....................................................................................................... 557
9.5.2.6 USS protocol execution error codes ..................................................................................... 560
9.5.2.7 USS protocol example program ............................................................................................ 561
9.6 Creating a user-defined library of instructions ...................................................................... 563
10 Debugging and troubleshooting ........................................................................................................... 565
10.1 Debugging your program ...................................................................................................... 565
10.1.1 Bookmark functions .............................................................................................................. 565
10.1.2 Cross reference table............................................................................................................ 566
10.2 Displaying program status .................................................................................................... 568
10.2.1 Displaying status in the program editor ................................................................................ 568
10.2.2 Configuring the STL status options ....................................................................................... 571
10.3 Using a status chart to monitor your program ...................................................................... 572
10.4 Forcing specific values.......................................................................................................... 574
10.5 Writing and forcing outputs in STOP mode .......................................................................... 575
S7-200 SMART
System Manual, V2.3, 07/2017, A5E03822230-AF
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