detailed description

BUS-DP cable with DP-2* 0.64 (0.34 MM2)

What is RS485?

In data communication, computer network and distributed industrial control system, serial communication is often used to realize data exchange. Currently, there are RS-232, RS-485, RS-422 several interface standards for serial communication. RS-232 is the earliest serial interface standard, in the short distance (<15M), the lower baud rate of serial communication are the widely used. Subsequently the RS-232 interface standard of short distance communication, baud rate is relatively low, in standard RS-232 interface based on the proposed standard RS-422, RS-485 interface is to overcome these defects. The following details of RS-232, RS-422, RS-485 interface standard.

RS-232 serial standard is a kind of serial communication in the low rate of increase in the communication distance of the single end standard. RS-232 to take the unbalanced transmission mode, that is, the single end communication. The data signal from the receiving end of the data signal is relative to the ground signal. So its common mode rejection capability, coupled with the distribution of twisted pair of capacitors, the maximum transmission distance of about 15M, the maximum rate of 20KBPS, and it can only support point to point communication.

In view of the limitation of RS-232 serial port standard, people put forward RS-422, RS-485 interface standard. RS-485/422 the balance transmission and differential points receiving mode to realize the communication: the sending end to serial TTL level signal is converted into differential signal a, B two output, after cable transmission at the receiving end of the differential signal is reduced into TTL level signals. Since the transmission line is usually used in twisted pair, and differential transmission, so it is very strong ability to resist common mode interference, bus transceiver with high sensitivity, can be detected as low as 200mV voltage. So the transmission signal can be recovered in the kilometer. About 1219m RS-485/422 maximum communication distance, maximum transmission rate for 10Mb/S, transmission rate and transmission distance is inversely proportional to, in the 100Kb/S transmission rate, only can achieve maximum communication distance. If you need longer transmission distance.

Need to add 485 repeater. RS-485 uses half duplex mode to support multipoint data communication. RS-485 bus network topology generally use the bus structure of the terminal matching. A bus is used to connect all the nodes together, which does not support the ring or star network. If you need to use a star structure, you have to use a 485 repeater or a 485 hub. RS-485/422 bus generally supports 32 nodes, if the use of a special 485 chips, you can reach 128 or 256 nodes, the maximum can support to 400 nodes

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RS485 RS485 SIEMENS RS485 communication line cable connector

2 core oxidation resistant tinned copper shield twisted pair communication cable YJ-RS485-2*18AWG RS485

4 core oxidation resistant tinned copper shield twisted pair communication cable YJ-RS485-2*2*18AWG RS485

6 core oxidation resistant tinned copper shield twisted pair communication cable YJ-RS485-3*2*18AWG RS485

Cable card and order No.

MC 291, 32K x 8 EEPROM 6ES7 291-8GE20-0XA0 memory box

The memory card, 64Kbytes 6ES7 291-8GF23-0XA0

The memory card, 256Kbytes 6ES7 291-8GH23-0XA0

CC 292, CPU 22X clock / date 6ES7 battery box 297-1AA20-0XA0

The new CPU 221 and 222 clock card (including battery card): a new clock card can only work in the new generation of CPU, a new clock card cannot 6ES7 297-1AA23-0XA0

Work in the second generation of CPU card, can not work in a new generation of CPU in the original time.

BC 293, CPU 22X 6ES7 291-8BA20-0XA0 battery box

Extension cable, I/O extension, 0.8 meters, CPU 22X/EM 6ES7 290-6AA20-0XA0

Programming communication cable, the PC / PPI, RS232 / 485 converter, photoelectric isolation belt, the maximum 187.5K baud rate, support multi master 6ES7 901-3CB30-0XA0

Programming communication cable PC / PPI, usb-rs485 conversion and photoelectric isolation belt, the maximum 187.5K baud rate, support multi master 6ES7 901-3DB30-0XA0

The programming software for Order No.

STEP 7-Micro/Win 32 (V4.0) single user license (including the SP6 upgrade package) 6ES7 810-2CC03-0YX0

STEP 7-Micro/Win 32 (V4.0) 6ES7 810-2CC03-0YX3 upgrade license

PC ACCESS V1.0 (Single license F.1 Installation 6ES7 840-2CC01-0YX0)

PC ACCESS V1.0 (Multicopy license) 6ES7 840-2CC01-0YX1

STEP 7-Micro/Win Add-on:STEP

32 7-Micro/Win instruction library, V1.1 (CD-ROM) 6ES7 830-2BC00-0YX0

Cable, network connector, interrupt for Order No.

MPI cable 6ES7 901-0BF00-0AA0

Profi bus 6XVI 830-0AH10 __ cable

Network bus connector with programming, vertical cable outlet 6ES7 972-0BB11-0XA0

Network bus connector without programming port, vertical cable outlet 6ES7 972-0BA11-0XA0

Network bus connector, not with programming, 35 degrees vertical cable outlet 6ES7 972-0BA40-0XA0

Network bus connector with programming, 35 degrees vertical cable outlet 6ES7 972-0BB40-0XA0

- network connector

Two network connector provided by SIEMENS can put a plurality of devices connected to the network easily

In. The two connector has two groups of screw terminals, can be connected to the network input and output. two types

The network and the network connector bias and terminal matching selection switch.

A connector only provides a connection to the CPU interface, while another connector adds a programming

The interface (see Figure 55).

A programming interface connection can put a SIMATIC programmer or operation panel added to the network in,

Without changing the existing network connection.

The signal to CPU programming port connector to the programming port. The connector for the connection from CPU

The power supply device (such as TD 200 or OP3) is very useful. The power supply connector of the programming port

Bare sets