ES7516-3UN00-0AB0 Qinxin sells Siemens SIEMENS programmable controller SIMATIC S7 series PLC, S7200, s71200, S7300, S7400, ET200 S7-200SMART; logic control module LOGO! 230RC, 230RCO, 230RCL, 24RC, 24RCL, etc.; SITOP series DC power supply 24V DC 1.3A, 2.5A, 3A, 5A, 10A, 20A, 40A; HMI touch screen TD200 TD400C TP177, MP277 MP377
SIMATIC S7-300, digital inputs SM 321, galvanically isolated 32 digital inputs, 24V DC, 1 40-pin
expand
If the user's automation task requires more than 8 SM, FM or CP module slots, the S7-300 (except CPU 312 and CPU 312C) can be expanded:
Up to 32 modules can be connected to the midpoint controller and 3 expansion racks:
A total of 3 Expansion Units (EU) can be connected to the Midpoint Controller (CC). Eight modules can be connected to each CC/EU.

Connect via interface template:
Each CC/EU has its own interface module. On the midpoint controller it is inserted in a slot next to the CPU and automatically handles communication with the expansion unit.
Expansion via IM 365:
1 extension unit can be extended up to 1 m away; supply voltage is also supplied through the extension unit.
Expansion via IM 360/361:
3 extension units, the distance between CC and EU and between EU and EU is 10m.
Install separately:
For a separate CC/EU, it is also possible to install at greater distances. Distance between two adjacent CC/EU or EU/EU: up to 10m.
Flexible mounting options:
CC/EU can be installed either horizontally or vertically. In this way, the space requirements can be met to the maximum extent possible. The S7-300 has different communication interfaces:
Communication processor for connecting AS-Interface, PROFIBUS and PROFINET/Industrial Ethernet cable systems.
Communication processors for point-to-point connections
Multipoint Interface (MPI), integrated in the CPU;
It is a cost-effective solution to connect programmers/PCs, HMI systems and other SIMATIC S7/C7 automation systems at the same time.
The SIMATIC S7-300 is connected to the PROFIBUS DP line system via a communications processor or via a CPU with an integrated PROFIBUS DP interface. Through a CPU with a PROFIBUS DP master/slave interface, a high-speed distributed automation system can be constructed and the operation is greatly simplified.

From the user's point of view, distributed I/O processing on PROFIBUS DP is no different from centralized I/O processing (same configuration, addressing and programming).
The following devices can be connected as master:
SIMATIC S7-300 (via CPU with PROFIBUS DP interface or PROFIBUS DP CP)
SIMATIC S7-400 (via CPU with PROFIBUS DP interface or PROFIBUS DP CP)
SIMATIC C7 (via C7 with PROFIBUS DP interface or PROFIBUS DP CP)
SIMATIC S5-115U/H, S5-135U and S5-155U/H with IM 308
SIMATIC 505
For performance reasons, no more than 2 masters are connected per line.
ET 200 distributed I/O device
S7-300 via CP 342-5
CPU 313C-2 DP, CPU 314C-2 DP, CPU 314C-2 PN/DP, CPU 315-2 DP, CPU 315-2 PN/DP, CPU 317-2 DP, CPU 317-2 PN/DP and CPU 319 -3 PN/DP
C7-633/P DP, C7-633 DP, C7-634/P DP, C7-634 DP, C7-626 DP, C7-635, C7-636
Field equipment
Although the programmer/PC or OP with STEP 7 is the master station on the line, only the MPI function is used, and the OP function can also be partially provided through PROFIBUS DP.

Process communication via PROFINET IO
The SIMATIC S7-300 is connected to the PROFINET IO line system via a communications processor or via a CPU with an integrated PROFINET interface. Through the CPU with PROFIBUS interface, a high-speed distributed automation system can be constructed, and the operation is greatly simplified.
From the user's point of view, there is no difference between distributed I/O processing on PROFINET IO and centralized I/O processing (same configuration, addressing and programming). Shanghai Zhenxihong Automation Co., Ltd.
The following devices can be connected as IO controllers:
SIMATIC S7-300 (using CPU with PROFINET interface or PROFINET CP)
SIMATIC ET 200 (using CPU with PROFINET interface)
SIMATIC S7-400 (using CPU with PROFINET interface or PROFINET CP)
The following devices can be connected as IO devices:

ET 200 distributed I/O device
ET 200S IM151-8 PN/DP CPU, ET 200pro IM154-8 PN/DP CPU
SIMATIC S7-300 (using CPU with PROFINET interface or PROFINET CP)
Field equipment
Process communication via AS-Interface
The S7-300 is equipped with a communications processor (CP 342-2) suitable for connecting field devices (AS-Interface slaves) via AS-Interface lines.
For more information, see Communications Processors.

Data communication via CP or integrated interface (point-to-point)
Point-to-point connections can be established cost-effectively via the CP 340/CP 341 communications processors or the integrated interfaces of the CPU 313C-2 PtP or CPU 314C-2 PtP. There are three physical transmission media that support different communication protocols:

20 mA (TTY) (only CP 340/CP 341)
RS 232C/V.24 (only CP 340/CP 341)
RS422/RS485

Siemens S7-300 SM321 PLC module
6ES7321-1BL00-0AA0
SIMATIC S7-300, digital inputs SM 321, galvanically isolated 32 digital inputs, 24V DC, 1 40-pin

The following devices can be connected:
SIMATIC S7, SIMATIC S5 automation systems and systems from other companies
printer
robot control
Scanners, Barcode Readers, etc.
The special function blocks are included in the scope of supply of the Communication Function Manual.
Data communication using multipoint interface (MPI)
MPI (Multipoint Interface) is the communication interface integrated on the SIMATIC S7-300 CPUs. It can be used for simple network tasks.
MPI can simultaneously connect several programmers/PCs with STEP 7, HMI systems (OP/OS), S7-300 and S7-400.
Full data:
The "full data communication" service enables cyclic data exchange between networked CPUs. One S7-300 CPU can exchange data with up to 4 data packets, each data contains 22 bytes of data, and 16 CPUs can participate in data exchange at the same time (using STEP 7 V4.x).
For example, one CPU can be allowed to access the input/output of another CPU. Full data communication is only possible via the MPI interface.
Internal communication line (C-bus):
The MPI of the CPU is directly connected to the C line of the S7-300. Therefore, the address of the FM/CP module connected to the C line can be found directly from the programmer through MPI.
Powerful communication technology:
Up to 32 MPI nodes.
There are several communication interfaces per CPU for S7 Basic Communication with SIMATIC S7-300/-400.
There are several communication interfaces per CPU for S7 communication with PG/PC, SIMATIC HMI system and SIMATIC S7-300/400.
Data transfer rate 187.5 kbit/s or 12 Mbit/s
Flexible configuration options:
Reliable components for establishing MPI communication: Line cables, line connectors and RS 485 repeaters of the PROFIBUS and "Distributed I/O" series. Using these components, the optimal adjustment of the design can be achieved according to the requirements. For example, up to 10 repeaters can be turned on between any two MPI nodes to bridge larger distances.
Data communication via CP
The SIMATIC S7-300 can be connected to PROFIBUS and Industrial Ethernet line systems via the CP 342 and CP 343 communication processors.