S7-1200 series PLC complete wiring diagram detailed explanation

Introduction

Siemens S7-1200 is a compact, modular PLC that can complete tasks such as simple logic control, advanced logic control, HMI and network communication. It is easy to design and implement automation systems that require network communication functions and single-screen or multi-screen HMI. It has advanced application functions that support small motion control systems and process control systems. SIMATIC S7-1200 has integrated technology for calculation and measurement, closed-loop control and motion control. It is a very powerful system that can realize many types of automation tasks. Below I share the complete wiring diagram of the S7-1200 series PLC with you, save it and read it slowly!

01 S7-1200 input and output wiring diagram

CPU 1211C Wiring Diagram

CPU 1211C AC/DC/Relay (6ES7 211-1BE40-0XB0)

① 24 VDC sensor power supply

② For sink input, connect the load to the “-” terminal (as shown); for source input, connect the load to the “+” terminal.

CPU 1211C DC/DC/Relay (6ES7 211-1HE40-0XB0)

① 24 VDC sensor power supply

② For sink input, connect the load to the “-” terminal (as shown); for source input, connect the load to the “+” terminal.

CPU 1211C DC/DC/DC (6ES7 211-1AE40-0XB0)

① 24 VDC sensor power supply

② For sink input, connect the load to the “-” terminal (as shown); for source input, connect the load to the “+” terminal.

CPU 1212C Wiring Diagram

CPU 1212C AC/DC/Relay (6ES7 212-1BE40-0XB0)

① 24 VDC sensor power supply

② For sink input, connect the load to the “-” terminal (as shown); for source input, connect the load to the “+” terminal.

CPU 1212C DC/DC/Relay (6ES7 212-1HE40-0XB0)

① 24 VDC sensor power supply

② For sink input, connect the load to the “-” terminal (as shown); for source input, connect the load to the “+” terminal.

CPU 1212C DC/DC/DC (6ES7 212-1AE40-0XB0)

① 24 VDC sensor power supply

② For sink input, connect the load to the “-” terminal (as shown); for source input, connect the load to the “+” terminal.

CPU 1214C Wiring Diagram

CPU 1214C AC/DC/Relay (6ES7 214-1BG40-0XB0)

① 24 VDC sensor power supply

② For sink input, connect the load to the “-” terminal (as shown); for source input, connect the load to the “+” terminal.

CPU 1214C DC/DC/Relay (6ES7 214-1HG40-0XB0)

① 24 VDC sensor power supply

② For sink input, connect the load to the “-” terminal (as shown); for source input, connect the load to the “+” terminal.

CPU 1214C DC/DC/DC (6ES7 214-1AG40-0XB0)

① 24 VDC sensor power supply

② For sink input, connect the load to the “-” terminal (as shown); for source input, connect the load to the “+” terminal.

CPU 1215C Wiring Diagram

CPU 1215C AC/DC/Relay (6ES7 215-1BG40-0XB0)

① 24 VDC sensor power supply

② For sink input, connect the load to the “-” terminal (as shown); for source input, connect the load to the “+” terminal.

CPU 1215C DC/DC/Relay (6ES7 215-1HG40-0XB0)

① 24 VDC sensor power supply

② For sink input, connect the load to the “-” terminal (as shown); for source input, connect the load to the “+” terminal.

CPU 1215C DC/DC/DC (6ES7 215-1AG40-0XB0)

① 24 VDC sensor power supply

② For sink input, connect the load to the “-” terminal (as shown); for source input, connect the load to the “+” terminal.

CPU 1217C Wiring Diagram

CPU 1217C DC/DC/DC (6ES7 217-1AG40-0XB0)

① 24 VDC sensor power supply

② For sink input, connect the load to the “-” terminal (as shown); for source input, connect the load to the “+” terminal.

③ 5V differential signal input

④ 5V differential signal output

Frequently asked questions

Can the 5V differential signal of 1217C be used as a normal DI/DO point?

Answer: No. For details, see the appendix of the S7-1200 System Manual.

Can the analog input channel of the S7-1200 CPU be connected to a 0-20mA current signal? How to connect it?

A: The analog input channel of S7-1200 supports 0-10 V voltage signal. If you need to connect 0-20mA current signal, you can connect a 500ohm resistor in parallel.

Note: When using a 500Ω resistor, be aware of the power consumption of this measurement method. Make sure that when a DC 24 V voltage is applied across the resistor, the power consumption of the resistor is at least 1.16 W. At the same time, the accuracy of this method cannot be guaranteed.

Take the S7-1200's built-in analog input channel connected to the commonly used two-wire sensor 4-20mA current signal as an example, as shown below:

02 Digital signal module input and output wiring diagram

SM 1221 Digital Inputs

For sink input, connect "-" to "M" (as shown); for source input, connect "+" to "M"

SM 1222 Digital Outputs

The SM1222 DQ 8 relay switching module controls two circuits using common terminals: one normally closed contact and one normally open contact.

For example, to output "0", when the output point is disconnected, the common terminal (0L) is connected to the normally closed contact (.0X) and disconnected from the normally open contact (.0). When the output point is connected, the common terminal (0L) is disconnected from the normally closed contact (.0X) and connected to the normally open contact (.0).

SM 1223 Digital Input/Output

For sink input, connect the load to the “-” terminal (as shown); for source input, connect the load to the “+” terminal.

SM 1223 also has modules with AC voltage input and relay output, as shown below:

SM 1223 DI 8 x 120/230 VAC, DQ 8 x Relay (6ES7 223-1QH32-0XB0)

Digital signal board
The signal board (SB) can be used to add I/O to the CPU. It provides a low-cost and effective expansion for all SIMATIC S7-1200 controllers while maintaining the original space. The SB is connected to the front end of the CPU.

SB 1221 200KHZ digital input wiring

Only supports source input

SB 1222 200KHZ digital output wiring

For source output, connect the load to the "-" terminal (as shown); for sink output, connect the load to the "+" terminal

SB 1223 200KHZ digital input/output wiring

① Only supports source input

② For source output, connect the load to the “-” terminal (as shown); for sink output, connect the load to the “+” terminal.

SB 1223 Digital Input/Output Wiring

Only supports sink input

Source/sink input wiring instructions
Signal board supporting source input:

6ES7 221-3BD30-0XB0
6ES7 221-3AD30-0XB0 6ES7
223-3BD30-0XB0
6ES7 223-3AD30-0XB0Supports
signal boards with sink input:

6ES7 223-0BD30-0XB0
supports source input signal templates:

6ES7 221-1BF32-0XB0
6ES7
221-1BH32-0XB0 6ES7 223-1PH32-0XB0
6ES7 223-1PL32-0XB0
6ES7 223-1BH32-0XB0
6ES7 223-1BL32-0XB0Supports
the following signal templates for sink input:

6ES7 221-1BF32-0XB0
6ES7
221-1BH32-0XB0 6ES7 223-1PH32-0XB0
6ES7 223-1PL32-0XB0
6ES7 223-1BH32-0XB0
6ES7 223-1BL32-0XB0
For more information, please refer to the S7-1200 System Manual.

Summary of digital input signal types: The CPU integrated input points and all input points of the signal template support both sink input and source input, while the input points of the signal board only support either source input or sink input.

For sink input, refer to the template wiring diagram. For source input wiring, refer to the figure below.

Source/sink output wiring instructions
Signal board supporting source output:

6ES7 222-1AD30-0XB0
6ES7 222-1BD30-0XB0
6ES7 223-3AD30-0XB0
6ES7 223-3BD30-0XB0
6ES7 223-0BD30-0XB0
Note: All transistor output signal modules that support source output only support source output and do not support sink output.

Signal board supporting sink output:

6ES7 222-1AD30-0XB0
6ES7 222-1BD30-0XB0
6ES7 223-3AD30-0XB0
6ES7 223-3BD30-0XB0
Note: For digital output signal types, only the 200 kHz signal board output supports both sink output and source output. Other signal boards, signal modules and CPU integrated transistor outputs only support source output.

Frequently asked questions

Why is SM1223 connected and the signal output channel indicator lighted, but there is no voltage output?

Answer: The power supply of the output channel indicator light of the S7-1200 expansion module is provided by the bus, but the signal output requires module power supply. The correct wiring method is shown in the figure below:

03 Analog module input and output wiring diagram

SM1231 analog input

SM 1232 Analog output

SM 1234 Analog Input/Output

SB 1231 Analog Input (Signal Board)

SB 1232 Analog Output (Signal Board)

AI connection sensor wiring method

Figure 1. 4-wire sensor

Figure 2. 3-wire sensor

Figure 3. 2-wire sensor

TC signal module

TC signal module wiring

TC signal board wiring

RTD Signal Module

RTD Signal Module Wiring

RTD Signal Board Wiring