Siemens SIMATIC S7 System Manual page 8

Table of contents
7.5.1 Layout of web pages ........................................................................................................ 190
7.5.2 Introduction .................................................................................................................... 191
7.5.3 Start page........................................................................................................................ 192
7.5.4 Module information ......................................................................................................... 193
7.5.5 Event log ......................................................................................................................... 193
7.5.6 Status chart ..................................................................................................................... 194
7.5.7 Watch table ..................................................................................................................... 194
7.5.8 Data log........................................................................................................................... 195
7.5.9 Set clock .......................................................................................................................... 196
7.6 User defined Web pages ................................................................................................... 196
7.6.1 Downloading user-defined Web resource files ................................................................... 197
7.7 Web API (Application Programming Interface) .................................................................. 199
8 Program instructions ......................................................................................................................... 201
8.1 Bit logic ........................................................................................................................... 201
8.1.1 Standard inputs ............................................................................................................... 201
8.1.2 Immediate inputs............................................................................................................. 202
8.1.3 Logic stack overview ........................................................................................................ 203
8.1.4 STL logic stack instructions............................................................................................... 205
8.1.5 NOT................................................................................................................................. 207
8.1.6 Positive and negative transition detectors......................................................................... 208
8.1.7 Coils: output and output immediate instructions .............................................................. 209
8.1.8 Set, reset, set immediate, and reset immediate functions.................................................. 209
8.1.9 Set and reset dominant bistable ....................................................................................... 210
8.1.10 NOP (No operation) instruction ........................................................................................ 212
8.1.11 Bit logic input examples ................................................................................................... 212
8.1.12 Bit logic output examples ................................................................................................. 214
8.2 Clock ............................................................................................................................... 215
8.2.1 Read and set real-time clock ............................................................................................. 215
8.2.2 Read and set real-time clock extended .............................................................................. 218
8.3 Communication ............................................................................................................... 221
8.3.1 GET and PUT (Ethernet).................................................................................................... 221
8.3.2 Transmit and receive (Freeport on RS485/RS232).............................................................. 229
8.3.3 Get port address and set port address (PPI protocol on RS485/RS232)................................ 241
8.3.4 Get IP address and set IP address (Ethernet)...................................................................... 242
8.3.5 Open user communication ............................................................................................... 244
8.3.5.1 OUC instructions.............................................................................................................. 244
8.3.5.2 OUC instruction error codes ............................................................................................. 255
8.4 Compare.......................................................................................................................... 256
8.4.1 Compare number values .................................................................................................. 256
8.4.2 Compare character strings................................................................................................ 259
8.5 Convert ........................................................................................................................... 261
8.5.1 Standard conversion instructions...................................................................................... 261
8.5.2 ASCII character array conversion....................................................................................... 264
8.5.3 Number value to ASCII string conversion .......................................................................... 270
8.5.4 ASCII sub-string to number value conversion .................................................................... 274
8.5.5 Encode and decode.......................................................................................................... 276
8.6 Counters.......................................................................................................................... 278
8.6.1 Counter instructions ........................................................................................................ 278
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System Manual, V2.7, 08/2022, A5E03822230-AK
S7-200 SMART