Product Introduction

DC speed regulation is divided into three types: rotor series resistance speed regulation, voltage regulation speed regulation, and weak magnetic speed regulation.

Rotor series resistance is generally used in low-precision speed regulation occasions. After the resistance is connected in series, the mechanical characteristic curve becomes soft, so it is generally used in reverse pull and reversing loads.

Voltage regulation speed regulation, the mechanical characteristic curve is very hard, and the speed can be adjusted while ensuring that the output torque remains unchanged, and high-precision speed regulation can be easily achieved.

Weak magnetic speed regulation, because the motor speed increases after weak magnetic field, it is generally used in conjunction with voltage regulation speed regulation. Disadvantages: The speed regulation range is small and can only increase speed but not decrease speed. Improper control is prone to runaway problems.

The 6SE7041-2UL84-1BH0 Ex(i) module is tested in accordance with [EExib]IIC. Therefore, there are two explosion-proof barriers on the module. However, [EExia] approval must be obtained to use sensors/actuators from explosion-proof zone 0. (There should be three explosion-proof barriers on the module). 1. Basic rack (central rack) For one-way basic communication, use system function SFC67 (X_GET) to read data from a passive station and use system function SFC68 (X_PUT) to write data to a passive station (server). These blocks are called only in the active station. For a two-way basic communication, call system function SFC65 (X_SEND) in the station where you want to send data to another active station. In the active receiving station, which is also active, the data will be recorded by system function SFC66 (X_RCV). 4. Check whether the fan and cabinet fan are running well. 6SE7041-2UL84-1BH0 Siemens agent

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Encoder failure

Hello everyone, *Recently we feel that the encoder (incremental type) we are using has some problems, and we plan to replace it with a newly bought one, but as soon as we replace it, 6RA70 reports F042 fault, fault value 1. I read the 6RA70 user manual and it says that the speed machine or pulse encoder cable is open. There must be no problem with the line, because when we replace it with the original one, it can be used normally again. The voltage is the same, but it is not from the same manufacturer. Later, I swapped AB again, and 6RA70 reported F042 fault value 2 again. What is the main reason for this? Can't we use this new encoder? We have several motors with the same problem. Thank you for your advice.

Supplementary question:

If the encoder model NPN and PNP are wrong, is there any way to convert them? Or do we have to change the same model? Or can we change the parameters or the line?

*Answer

1. The pulse number is different. Try changing P141 to the corresponding pulse number.

2. Either the PNP or NPN model is wrong.

I can't think of anything else for now.

ESM2000-9983 DC speed regulator is a motor speed regulation device, including motor DC speed regulator, pulse width DC speed regulator, thyristor DC speed regulator, etc. It is generally a modular DC motor speed regulator, integrating power supply, control, and drive circuits. It adopts a three-dimensional structure layout. The control circuit uses micro-power consumption components, and uses optocouplers to achieve current and voltage isolation conversion. The proportional constant, integral constant, and differential constant of the circuit are adjusted with a PID adapter. The speed regulator is small in size and light in weight. It can be used alone or directly installed on a DC motor to form an integrated DC speed regulating motor. It has all the functions that a speed regulator should have.

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6SE7041-2UL84-1BH0 -0.8A (with CPU312, CPU312C and CPU312IFM installed)1. Composition of user software If only one end of the shield is grounded (single-ended shield), only low-frequency interference can be attenuated. (1) Function of DO template The digital output module SM322 converts the internal signal level of S7-300 into the external signal level required by the process, and can be directly used to drive solenoid valves, contactors, small motors, lamps and motor starters.

The data module SM321 (MLFB6ES7321-7BH00-0AB0) in the 6SE7041-2UL84-1BH0 data block can also be used in ET200M. Among them, CPU31x-2DP is used as DP master or communication processor CPCP342-5 is used as DP master. Similarly, this module can be connected to an S7-400CPU via ET200M and S7-400 communication processor CP443-5. However, alarms usually do not occur in groups. When programming, you need to pay attention to the first call of the alarm block, because all the blocks used here require a long runtime, so the runtime of the called OB will increase significantly in some cases. Since these CPUs do not have integrated load memory, the MMC must be inserted before using the CPU, otherwise it will not work.

6SE7041-2UL84-1BH0

Siemens S7-400PLC Multi-CPU Communication

Notes on the multi-CPU environment in Siemens S7-400PLC Running on the sub-rack UR1 or UR2 with a common K bus and P bus without segmentation? All CPU operating states (CPU operating system performance) operating on a common peripheral bus (P) and communication (K) bus will be automatically synchronized.

1. Notes on the multi-CPU environment in Siemens S7-400 PLC

Running on the sub-rack UR1 or UR2 with a common K bus and P bus without segmentation

? All CPU operating states (CPU operating system performance) operating on a common peripheral bus (P) and communication (K) bus will be automatically synchronized.

? A complex large task can be split up to 4 CPUs for calculation.

? A proportional upgrade of performance is possible by simply inserting a CPU.

? Increase system resources (memory, standard area, counters ...). However, the number of input/output points does not increase.

? It is possible to separate time-critical and non-time-critical process areas (i.e.: fast control of a fast closed-loop controller).

? Multiple CPUs can share a CP template and external communication. I/O templates can only have one CPU. If one stops, the other CPUs will also stop.

? The following order numbers of S7-CPU support multi-CPU operation mode:

Operation on segmented sub-rack CR2

? The segmented sub-rack contains two independent P buses, 10 slots in segment 1 and 8 slots in segment 2.

? Each peripheral bus segment uses a CPU, and the I/O modules are assigned to the local CPU. The CPUs run independently of each other, without synchronization of operating states.

? A common communication bus allows communication between the subunits without the need for additional hardware.

? Thus, 2 separate controllers can be configured in one CR. This saves space in the cabinet.

? Cost savings, since only one subrack and one power supply unit are required.

? Both S7-400 and M7-400 CPUs can be used without any restrictions, i.e. even S7 and M7 CPUs can be placed together in CR2. (Warning: To run M7-CPU 486-3 together with 488-3 in CR2, only M7-SYS V2.0 and STEP7 basic software V3.1 can be used. The original CPUs 488-4 and 488-5 cannot be run in CR2).

Select the project name on the right, InsertStationSIMATIC300. Bidirectional connection: connection between two CPUs: each CPU can send and receive a GD packet. Yes, you can also use the SM322-1HH01 with a load voltage of 24V AC.

6SE7041-2UL84-1BH0 Brand new and original

6SE7041-2UL84-1BH0

A set of S7-400H PLC, including

(1) 1 mounting rack UR2-H

(2) 2 power supply modules PS 407 10A

(3) 2 fault-tolerant CPUs, CPU414-4H or CPU 417-4H

(4) 4 synchronization sub-modules

(5) 2 fiber optic cables

An ET200M distributed I/O device, including

(6) 2 IM 153-2

(7) 1 digital input module

(8) 1 digital output module

Accessories, such as PROFIBUS shielded cable and network connector, etc.

Software:

STEP 7 V5.3 SP2 Standard Edition (with integrated redundancy option package) or higher.

2.2 Hardware Installation

(1) Set the rack number

For CPU V3 version, set it through the switch on the synchronization sub-template;

For CPU V4 version, set it through the switch on the CPU backplane

This rack number takes effect after the CPU is powered on.

(2) Insert the synchronization sub-template into the CPU board.

(3) Connect the synchronization optical cable

Connect the two synchronization sub-templates located at the top;

Connect the two synchronization sub-templates located at the bottom;

Before turning on the power or starting the system, make sure that the CPU's synchronization optical cable is connected. The connection of the synchronization optical cable is shown in Figure 2-1:

Figure 2-1 Connection of S7-400H synchronization optical cable

(4) Configure the distributed I/O station ET200M as a DP slave station with switching function.

(5) Connect the programmer to the first fault-tolerant CPU (CPU0), which is the main CPU of the S7-400H.

(6) CPU self-check after power-on

When the CPU is powered on for the first time, a RAM check will be performed, which takes about 3 minutes. During this period, the CPU does not receive data from the MPI interface, and the STOP LED flashes. If there is a backup battery, this check will not be performed when the power is turned on again.

1. Power module: PS307-5A; provides a stable 24V DC power supply for the PLC system. 1.3 Hardware configuration When CP342-5 is used as a PROFIBUSDP master station, it can connect up to 124 slave stations, and can exchange up to 244 input bytes (Input) and 244 output bytes (Output) with each slave station, and can exchange up to 2160 input bytes and 2160 output bytes with all slave stations. When using an expansion rack, in addition to the module rack and interface module (IM), an additional power module may be required. It should be noted that in an S7-300 configuration, if a direct read access is performed across the module I/O (using this command to read several bytes at a time), an incorrect value will be read. The specific address can be viewed in the hardware. For 8-bit type modules, the input and output each occupy one byte, and they have the same byte address. If fixed slot addressing is used, and SM323 is inserted into slot 4, the input address is I4.0 to I4.7, and the output address is Q4.0 to Q4.7.

6SE7041-2UL84-1BH0 6SE7041-2UL84-1BH0 Brand new and original

Multi-CPU processing

Up to 4 CPUs with multi-CPU processing capabilities can run simultaneously on the S7-400 central rack. These CPUs automatically and synchronously change their operating modes.

Applicable occasions: The program is too long, the storage space is insufficient, and the system can be divided. The CPUs are interconnected through the communication bus.

(3) Input/output module

The signal module address of S7-400 is automatically generated in STEP 7. It can be modified by the user.

The starting address of the analog module of S7-400 starts from 512, and the addresses of the same type of modules are arranged in sequence.

Section 3 Programming language and instruction system of S7-300/400

I. Programming language of S7-300/400

1.1 International standard of PLC programming language

IEC 61131 is the international standard of PLC. Parts 1 to 4 of the IEC 61131 standard were released from 1992 to 1995. my country released GB/T 15969-1/2/3/4 (equivalent to IEC 61131-1/2/3/4) in November 1995.

IEC 61131-3 is widely used in PLC, DCS and industrial computers, "software PLC", CNC systems, RTU and other products.

Defines 5 programming languages

Instruction list IL (Instruction list): Siemens calls it statement list STL.

Structured text ST (Structured text): Siemens calls it structured control language (SCL).

Ladder diagram LD (Ladder diagram): Siemens abbreviates it as LAD.

 Function block diagram FBD (Function block diagram): The standard calls it function block diagram language.

 Sequential function chart SFC (Sequential function chart): Corresponds to Siemens' S7 Graph.

4. Confirm that the power supply voltage and frequency comply with the provisions of this regulation. The CP342-5 module has an internal Input and

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