Product Introduction

6SE7042-1WN84-1CF0 adapter board In the program, if the processing of some data has strict requirements on the time cycle, such as the PID module, if the control cycle is required to be 200 milliseconds, and the cyclic scan time of OB1 is more than ten or tens of seconds, then using the timer in OB1 will produce a large error. To ensure an accurate control cycle, we can put the PID control module into the timing interrupt module OB35. In this way, the control can be executed once every 100ms. 34: Can a 2-wire sensor be connected to the analog input of a compact CPU? In this case, when configuring with the "Hardware Configuration" software, you must activate the "Replace module during operation" (hot swap) function. The main technical performance of the S7-200 series PLC input/output expansion module is shown in Table 2.

S7-200 is a small programmable controller suitable for automation of detection, monitoring and control in various industries and occasions. The powerful functions of the S7-200 series enable it to realize complex control functions whether in independent operation or connected to a network. Therefore, the S7-200 series has a very high performance/price ratio.

C. Can the AI integrated in the 224XP body receive current signals of 0~20mA?

First of all, these two analog input channels can receive voltage signals of ±10V, but cannot directly receive current signals. If this channel is used to receive current signals, there will be certain risks, which may lead to inaccurate measurements or damage to the module, etc. For detailed instructions, please click to view

D. How to perform proportional conversion on the analog values of the S7-200 CPU224XP and expansion modules EM 231, EM 232 and EM 235?

The signals collected by the S7-200 analog input channels are represented by values between 0 and 32000 and stored in AIW.

That is to say, there is a certain proportional conversion relationship between this value and the actual physical quantity.

1). In STEP7 Micro/WIN software (S7-200 programming software), a software filtering function is set for the analog input channel, as shown in the figure. For details, please refer to "S7-200? LOGO? SITOP Reference" -> System Block-Analog Filter.

However, when setting the analog channel filtering in the system block, the analog channels occupied by the RTD and TC modules should be disabled.

(2) Both the EM231 TC and RTD modules have a 24V power indicator and an SF fault indicator. As shown in the figure: (a)

If the 24V power indicator = OFF, it means that the module has no 24V working power supply; (b) If the SF red light flashes, the reason may be: the internal software of the module detects that the external connection is disconnected, or the input is out of range.

Note: When the 6th and 7th channels are selected as current input, the 0->5th channel can only input a voltage of 0-5V.

B. Temperature measurement analog input module (thermocouple TC; thermal resistor RTD):

If the sensor is a thermal resistor or thermocouple, and the output signal is directly connected to the analog input, a special temperature measurement module needs to be selected. The temperature measurement module is divided into the thermal resistor module EM231RTD and the thermocouple module EM231TC. Note: Different signals should be connected to the corresponding modules, such as: thermal resistor signals should use EM231RTD, but not EM231TC. And the input type of the same module should be consistent, such as: Pt1000 and Pt100 cannot be used on the same thermal resistor module at the same time.

The 6SE7042-1WN84-1CF0 adapter board mark cannot be connected to sensors/actuators from explosion-proof zone 0. But sensors/actuators from explosion-proof zone 1 can be directly connected. In the user program, the command LPIW is used for Word access and LPID is used for Dword access. Module I/O Label The assignment of module I/O to system sensors and actuators can be recorded on the label strip.

Module Installation

The S7-200 digital module can be installed anywhere to the right of the CPU module.

Each S7-200 digital module comes with a ribbon I/O bus cable. If the cable meets the installation width requirements between modules, the cable can be directly plugged into the 10-pin slot on other modules. The specific address assignment of the module can also be viewed in the Step 7 Micro/Win programming software as shown below. Use the menu command "PLC > Information" of the Step 7 Micro/Win programming software to view the actual location of the expansion module and the I/O address assignment. As shown in the above example: CPU224XP expands 4DI/4DO. Its address allocation is shown in the figure below: It can be seen that the module position of the digital module is 0, the input point starting address is I2.0, and the output point starting address is

AI analog input module

A. Ordinary analog input module:

If the analog quantity output by the sensor is a voltage or current signal (such as ±10V or 0~20mA), you can choose an ordinary

analog input module and select the input signal range by setting the dip switch. Note: According to the standard wiring,

try to use the channel sequence on the module (A->D), and the channel without signal should be short-circuited. For details, please refer to

Appendix A-Introduction to Analog Modules in the "S7-200 Programmable Controller System Manual".

4AI EM231 module:

First, the analog input module can select the signal range by setting the dip switch. The switch setting is applied to the entire module. A module can only be set to one measurement range, and the switch setting can only take effect after power is turned on again. That is to say, once the dip switch setting is determined, the range of these four channels is also determined. As shown in the following table: Note: The dip switch settings of 0~5V and 0~20mA (4~20mA) in the table are the same, that is, when the dip switch is set to this, the signal range of the input channel can be 0~5V or 0~20mA. 8AI EM231 module: 8AI EM231 module, channels 0->5 can only be used for voltage input, and only channels 6 and 7 can be used for current input. Use dip switches 1 and 2 to set them: when sw1=ON, channel 6 is used for current input; when sw2=ON, channel 7 is used for current input. Conversely, if the selection is OFF, the corresponding channel is voltage input. 6SE7042-1WN84-1CF0 adapter board 6ES7322-8BF00-0AB0 SIMATICS7-300, digital output SM322, photoelectric isolation, 8DO, 24VDC, 0.5A (1X8DO), short circuit protection, diagnostics, 20-pin start address = (slot number - 4) × 16; in the library. . S7-200 series PLC is a small PLC launched by SIEMENS.

Repair 6SE7042-1WN84-1CF0 adapter board

The DO point of the transistor output type of the S7-200 digital module cannot output high-speed pulses; the DO point of the relay output has a switching frequency of 1HZ and has a mechanical life, so it cannot be switched frequently.

In addition to the above important parameters, you also need to pay attention to the load type connected to the module, especially when the digital output point is connected to an inductive load, a protection circuit should be designed.

For inductive load design, please refer to Chapter 3 S7-200 Installation -> Inductive Load Design Guide of S7-200 Programmable Controller System Manual.

A. Correspondence between analog input and digital quantity:

Analog signal (0~10V, 0~5V or 0~20mA) is represented by 0~32000 values inside S7-200 CPU

(Note: 4~20mA corresponds to 6400~32000). There is a certain mathematical relationship between the two, as shown in the figure:

B. Introduction to the hardware wiring of analog module

(1) CPU 224 XP integrates 2 voltage inputs. The wiring method is shown in a: A+ and M, B+ and M respectively. At this time,

only ±10V voltage signal can be input.

CPU 224XP also integrates 1 analog output signal. For current output, as shown in Figure b, connect the load between the I and M terminals; for voltage output, as shown in Figure c, connect the load between the V and M terminals.

2) Wiring method for analog input

Taking the 4AI EM231 module as an example, the wiring methods for voltage and current input signals are introduced respectively, as shown in the figure.

Note: This wiring diagram is a schematic diagram, which describes different wiring methods. It does not mean that only the A channel of this module can be connected to voltage, the B channel must be left floating, and the C and D channels can only be connected to current.

When your signal is a voltage input, you can refer to the wiring method a, and so on.

Method a. Voltage input method: positive signal is connected to A+; negative signal is connected to A-;

Method b. Unused channel connection method (do not leave it floating): unused channels need to be short-circuited, such as short-circuiting B+ and B-;

Method c. Current input method (four-wire system): positive signal is connected to C+, and C+ is short-circuited with RC;

Negative signal is connected to C-, and C- is short-circuited with the M terminal of the module.

Method d. Current input method (two-wire system): The signal line is connected to D+, and D+ is short-circuited with RD;

The M terminal of the power supply is connected to D-, and is short-circuited with the M terminal of the module.

Note: For details, please refer to: "S7-200? LOGO? SITOP Reference" -> Analog module wiring.

If you do not want to obtain compensation for the 6SE7042-1WN84-1CF0 adapter board, simply jumper pins 3-4 and pins 5-6 on the front switch. For the following CPU models, please check whether the 24V voltage is connected to pin 1. The LED is controlled by the input current. The 24V voltage on pin 1 needs to be further processed. 2.6.4 Cycle time and response time 1. Cycle time For a process, the most important parameters are the cycle time and response time. Check the name of the workstation and the workstation (standort) specification in the TeleService dialog box.

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