Siemens SIMATIC S7-1200

Siemens SIMATIC S7-1200

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Communication processor and Modbus TCP

13.8 Legacy Modbus TCP communication

S7-1200 Programmable controller

System Manual, V4.2, 09/2016, A5E02486680-AK

1267

13.8.4.4

Example: Legacy MB_CLIENT 3: Output image write request

This example shows a Modbus client request to write the S7-1200 output image.

Network 1:

Modbus function 15 - Write S7-1200 output image bits

Table of Contents

S7-1200 Programmable controller1
Preface3
Table of contents7
1 Product overview27
- 1.1 Introducing the S7-1200 PLC27
- 1.2 Expansion capability of the CPU30
- 1.3 Basic HMI panels32
2 New features33
3 STEP 7 programming software37
- 3.1 System requirements38
- 3.2 Different views to make the work easier39
- 3.3 Easy-to-use tools41
- 3.4 Backward compatibility51
4 Installation53
- 4.1 Guidelines for installing S7-1200 devices53
- 4.2 Power budget56
- 4.3 Installation and removal procedures57
- 4.4 Wiring guidelines76
5 PLC concepts83
- 5.1 Execution of the user program83
- 5.2 Data storage, memory areas, I/O and addressing117
  - 5.2.1 Accessing the data of the S7-1200117
- 5.3 Processing of analog values123
- 5.4 Data types125
- 5.5 Using a memory card138
- 5.6 Recovery from a lost password151
6 Device configuration153
- 6.1 Inserting a CPU154
- 6.2 Uploading the configuration of a connected CPU156
- 6.3 Adding modules to the configuration158
- 6.4 Configuration control159
- 6.5 Changing a device170
- 6.6 Configuring the operation of the CPU170
- 6.7 Configuring multilingual support175
- 6.8 Configuring the parameters of the modules177
- 6.9 Configuring the CPU for communication179
- 6.10 Time synchronization181
7 Programming concepts183
- 7.1 Guidelines for designing a PLC system183
- 7.2 Structuring your user program185
- 7.3 Using blocks to structure your program187
- 7.4 Understanding data consistency198
- 7.5 Programming language199
- 7.6 Protection210
- 7.7 Downloading the elements of your program216
- 7.8 Synchronizing the online CPU and offline project219
- 7.9 Uploading from the online CPU221
  - 7.9.1 Comparing the online CPU to the offline CPU221
- 7.10 Debugging and testing the program222
8 Basic instructions227
- 8.1 Bit logic operations227
- 8.2 Timer operations236
- 8.3 Counter operations244
- 8.4 Comparator operations250
- 8.5 Math functions255
- 8.6 Move operations265
- 8.7 Conversion operations290
- 8.8 Program control operations302
- 8.9 Word logic operations326
- 8.10 Shift and rotate332
  - 8.10.1 SHR (Shift right) and SHL (Shift left) instructions332
  - 8.10.2 ROR (Rotate right) and ROL (Rotate left) instructions333
9 Extended instructions335
- 9.1 Date, time-of-day, and clock functions335
- 9.2 String and character346
- 9.3 Distributed I/O (PROFINET, PROFIBUS, or AS-i)384
- 9.4 PROFIenergy419
- 9.5 Interrupts420
- 9.6 Alarms436
  - 9.6.1 Gen_UsrMsg (Generate user diagnostic alarms)436
- 9.7 Diagnostics (PROFINET or PROFIBUS)439
- 9.8 Pulse487
- 9.9 Recipes and Data logs498
  - 9.9.1 Recipes498
  - 9.9.2 Data logs509
- 9.10 Data block control534
- 9.11 Address handling544
- 9.12 Common error codes for the Extended instructions553
10 Technology instructions555
- 10.1 Counting (High-speed counters)555
- 10.2 PID control588
- 10.3 Motion control653
11 Communication799
- 11.1 Asynchronous communication connections801
- 11.2 PROFINET804
- 11.3 PROFIBUS968
- 11.4 AS-i975
- 11.5 S7 communication986
12 Web server1001
- 12.1 Enabling the Web server1003
- 12.2 Configuring Web server users1005
- 12.3 Accessing the Web pages from a PC1007
- 12.4 Accessing the Web pages from a mobile device1009
- 12.5 Using a CP module to access Web pages1010
- 12.6 Standard Web pages1011
- 12.7 User-defined Web pages1040
- 12.8 Constraints1082
13 Communication processor and Modbus TCP1087
- 13.1 Using the serial communication interfaces1087
- 13.2 Biasing and terminating an RS485 network connector1088
- 13.3 Point-to-point (PtP) communication1090
- 13.4 Universal serial interface (USS) communication1146
- 13.5 Modbus communication1166
- 13.6 Legacy PtP communication (CM/CB 1241 only)1217
  - 13.6.1 Legacy point-to-point instructions1218
- 13.7 Legacy USS communication (CM/CB 1241 only)1234
- 13.8 Legacy Modbus TCP communication1249
- 13.9 Legacy Modbus RTU communication (CM/CB 1241 only)1269
- 13.10 Industrial Remote Communication (IRC)1288
14 TeleService communication (SMTP email)1301
- 14.1 TM_Mail (Send email) instruction1301
15 Online and diagnostic tools1309
- 15.1 Status LEDs1309
- 15.2 Going online and connecting to a CPU1313
- 15.3 Assigning a name to a PROFINET IO device online1314
- 15.4 Setting the IP address and time of day1316
- 15.5 Resetting to factory settings1317
- 15.6 Updating firmware1318
- 15.7 Formatting a SIMATIC memory card from STEP 71320
- 15.8 CPU operator panel for the online CPU1321
- 15.9 Monitoring the cycle time and memory usage1321
- 15.10 Displaying diagnostic events in the CPU1322
- 15.11 Comparing offline and online CPUs1323
- 15.12 Performing an online/offline topology comparison1324
- 15.13 Monitoring and modifying values in the CPU1325
- 15.14 Downloading in RUN mode1335
- 15.15 Tracing and recording CPU data on trigger conditions1347
- 15.16 Determining the type of wire break condition from an SM 1231 module1349
- 15.17 Backing up and restoring a CPU1352
A Technical specifications1359
- A.1 Siemens Online Support website1359
- A.2 General technical specifications1359
- A.3 PROFINET interface X1 port pinouts1369
- A.4 CPU 1211C1370
  - A.4.1 General specifications and features1370
  - A.4.2 Timers, counters, and code blocks supported by CPU 1211C1372
  - A.4.3 Digital inputs and outputs1376
  - A.4.4 Analog inputs1377
  - A.4.5 CPU 1211C wiring diagrams1379
- A.5 CPU 1212C1382
  - A.5.1 General specifications and features1382
  - A.5.2 Timers, counters, and code blocks supported by CPU 1212C1384
  - A.5.3 Digital inputs and outputs1388
  - A.5.4 Analog inputs1390
  - A.5.5 CPU 1212C wiring diagrams1392
- A.6 CPU 1214C1395
  - A.6.1 General specifications and features1395
  - A.6.2 Timers, counters and code blocks supported by CPU 1214C1397
  - A.6.3 Digital inputs and outputs1401
  - A.6.4 Analog inputs1403
  - A.6.5 CPU 1214C wiring diagrams1405
- A.7 CPU 1215C1409
  - A.7.1 General specifications and features1409
  - A.7.2 Timers, counters and code blocks supported by CPU 1215C1411
  - A.7.3 Digital inputs and outputs1415
  - A.7.4 Analog inputs and outputs1417
  - A.7.5 CPU 1215C wiring diagrams1420
- A.8 CPU 1217C1425
  - A.8.1 General specifications and features1425
  - A.8.2 Timers, counters and code blocks supported by CPU 1217C1427
  - A.8.3 Digital inputs and outputs1430
  - A.8.4 Analog inputs and outputs1435
  - A.8.5 CPU 1217C wiring diagrams1438
  - A.8.6 CPU 1217C Differential Input (DI) detail and application example1440
  - A.8.7 CPU 1217C Differential Output (DQ) detail and application example1441
- A.9 Digital signal modules (SMs)1442
  - A.9.1 SM 1221 digital input specifications1442
  - A.9.2 SM 1222 8-point digital output specifications1444
  - A.9.3 SM 1222 16-point digital output specifications1446
  - A.9.4 SM 1223 digital input/output V DC specifications1451
  - A.9.5 SM 1223 digital input/output V AC specifications1456
- A.10 Analog signal modules (SMs)1459
  - A.10.1 SM 1231 analog input module specifications1459
  - A.10.2 SM 1232 analog output module specifications1464
  - A.10.3 SM 1234 analog input/output module specifications1466
  - A.10.4 Step response of the analog inputs1470
  - A.10.5 Sample time and update times for the analog inputs1470
  - A.10.6 Measurement ranges of the analog inputs for voltage and current (SB and SM)1471
  - A.10.7 Measurement ranges of the analog outputs for voltage and current (SB and SM)1472
- A.11 Thermocouple and RTD signal modules (SMs)1473
  - A.11.1 SM 1231 Thermocouple1473
    - A.11.1.1 Basic operation for a thermocouple1476
    - A.11.1.2 Selection tables for the SM 1231 thermocouple1477
  - A.11.2 SM 1231 RTD1479
    - A.11.2.1 Selection tables for the SM 1231 RTD1482
- A.12 Technology modules1485
  - A.12.1 SM 1278 4xIO-Link Master SM1485
- A.13 Digital signal boards (SBs)1500
  - A.13.1 SB 1221 200 kHz digital input specifications1500
  - A.13.2 SB 1222 200 kHz digital output specifications1502
  - A.13.3 SB 1223 200 kHz digital input / output specifications1505
  - A.13.4 SB 1223 2 X 24 V DC input / 2 X 24 V DC output specifications1508
- A.14 Analog signal boards (SBs)1511
  - A.14.1 SB 1231 1 analog input specifications1511
  - A.14.2 SB 1232 1 analog output specifications1514
  - A.14.3 Measurement ranges for analog inputs and outputs1516
  - A.14.4 Thermocouple signal boards (SBs)1519
    - A.14.4.1 SB 1231 1 analog thermocouple input specifications1519
    - A.14.4.2 Basic operation for a thermocouple1520
  - A.14.5 RTD signal boards (SBs)1523
    - A.14.5.1 SB 1231 1 analog RTD input specifications1523
    - A.14.5.2 Selection tables for the SB 1231 RTD1526
- A.15 BB 1297 Battery board1528
- A.16 Communication interfaces1530
  - A.16.1 PROFIBUS1530
  - A.16.2 CP 1242-71534
  - A.16.3 CM 1243-2 AS-i master1538
    - A.16.3.1 Technical data for the AS-i master CM 1243-21538
    - A.16.3.2 Electrical connections of the AS-i master1539
  - A.16.4 RS232, RS422, and RS4851541
- A.17 TeleService (TS Adapter and TS Adapter modular)1546
- A.18 SIMATIC memory cards1546
- A.19 Input simulators1547
- A.20 S7-1200 Potentiometer module1549
- A.21 I/O expansion cable1550
- A.22 Companion products1551
  - A.22.1 PM 1207 power module1551
  - A.22.2 CSM 1277 compact switch module1551
  - A.22.3 CM CANopen module1552
  - A.22.4 RF120C communications module1552
  - A.22.5 SM 1238 Energy meter module1553
  - A.22.6 SIWAREX electronic weighing systems1553
B Calculating a power budget1555
C Ordering Information1559
- C.1 CPU modules1559
- C.2 Signal modules (SMs), signal boards (SBs), and battery boards (BBs)1560
- C.3 Communication1561
- C.4 Fail-Safe CPUs and signal modules1563
- C.5 Other modules1563
- C.6 Memory cards1563
- C.7 Basic HMI devices1564
- C.8 Spare parts and other hardware1564
- C.9 Programming software1569
D Device exchange and spare parts compatibility1571
- D.1 Exchanging a V3.0 CPU for a V4.2 CPU1571
- D.2 S7-1200 V3.0 and earlier terminal block spare kits1578
Index1581
- &1581
- /1581
- =1581
- >1581
- A1581
- B1582
- C1583
- D1586
- E1588
- F1591
- G1591
- H1592
- I1592
- J1597
- K1598
- L1598
- M1598
- N1600
- O1601
- P1601
- Q1605
- R1605
- S1606
- T1609
- U1611
- V1612
- W1612
- X1613

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Reference Manual88 pages

Getting Started60 pages

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