Table of contents
S7-1200 Programmable controller
System Manual, 03/2014, A5E02486680-AG
9
4.5.4 Program card ............................................................................................................................. 130
4.5.5 Firmware update ........................................................................................................................ 133
4.6 Recovery from a lost password .................................................................................................. 136
5 Device configuration............................................................................................................................ 137
5.1 Inserting a CPU .......................................................................................................................... 138
5.2 Detecting the configuration for an unspecified CPU .................................................................. 140
5.3 Adding modules to the configuration ......................................................................................... 141
5.4 Changing a device ..................................................................................................................... 142
5.5 Configuring the operation of the CPU ........................................................................................ 142
5.5.1 Overview .................................................................................................................................... 142
5.5.2 Configuring digital input filter times ............................................................................................ 144
5.5.3 Pulse catch ................................................................................................................................. 146
5.6 Configuring the parameters of the modules ............................................................................... 147
5.7 Configuring the CPU for communication ................................................................................... 149
5.7.1 Creating a network connection .................................................................................................. 149
5.7.2 Configuring the Local/Partner connection path .......................................................................... 150
5.7.3 Parameters for the PROFINET connection ............................................................................... 153
5.7.4 Assigning Internet Protocol (IP) addresses ............................................................................... 155
5.7.4.1 Assigning IP addresses to programming and network devices ................................................. 155
5.7.4.2 Checking the IP address of your programming device .............................................................. 157
5.7.4.3 Assigning an IP address to a CPU online .................................................................................. 158
5.7.4.4 Configuring an IP address for a CPU in your project ................................................................. 159
5.7.5 Testing the PROFINET network ................................................................................................ 162
5.7.6 Locating the Ethernet (MAC) address on the CPU .................................................................... 163
5.7.7 Configuring Network Time Protocol synchronization ................................................................. 165
5.7.8 PROFINET device start-up time, naming, and address assignment ......................................... 166
6 Programming concepts ....................................................................................................................... 169
6.1 Guidelines for designing a PLC system ..................................................................................... 169
6.2 Structuring your user program ................................................................................................... 170
6.3 Using blocks to structure your program ..................................................................................... 172
6.3.1 Organization block (OB) ............................................................................................................. 172
6.3.2 Function (FC) ............................................................................................................................. 174
6.3.3 Function block (FB) .................................................................................................................... 175
6.3.4 Data block (DB) .......................................................................................................................... 176
6.3.5 Creating reusable code blocks ................................................................................................... 177
6.4 Understanding data consistency ................................................................................................ 178
6.5 Programming language .............................................................................................................. 179
6.5.1 Ladder logic (LAD) ..................................................................................................................... 180
6.5.2 Function Block Diagram (FBD) .................................................................................................. 181
6.5.3 SCL ............................................................................................................................................ 181
6.5.4 EN and ENO for LAD, FBD and SCL ......................................................................................... 188
6.6 Protection ................................................................................................................................... 190
6.6.1 Access protection for the CPU ................................................................................................... 190
6.6.2 Know-how protection ................................................................................................................. 193
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