Mitsubishi PLC adopts extended memory communication to control inverter system configuration - Database & Sql Blog Articles

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1. System hardware components
FX2N series Mitsubishi plc (product version V 3.00 or more) 1 set (software adopts FX-PCS/WIN-C V 3.00 version);
Mitsubishi plc-FX2N-485-BD communication template 1 block (the longest communication distance 50m);
Or 1 block of FX0N-485ADP communication module + 1 block of FX2N-CNV-BD board (the longest communication distance is 500m);
FX2N-ROM-E1 function expansion storage box 1 (installed in the PLC body);
8 sets of Mitsubishi inverters with RS485 communication port (S500 series, E500 series, F500 series, F700 series, A500 series, V500 series, etc., can be mixed with each other, the total number does not exceed 8 units; the communication parameter number of all series of Mitsubishi inverters , the command code and the data code are the same.);
RJ45 cable (5 core with shielding);
Terminal resistor (terminal resistance) 100Ω;
Option: 1 set of man-machine interface (such as small Mitsubishi touch screen such as F930GOT).
2. Hardware installation method
(1) Use one of the cable crimping pliers to crimp one end of the cable to the RJ45 crystal head; the other end to connect the FX2N-485-BD communication template according to the method of Figure 1 to Figure 3. The two unused P5S ends are not Pick up.
(2) Uncover the panel cover on the left side of the PLC main unit, and install the FX2N-485-BD communication template and FX2N-ROM-E1 function expansion memory to cover the upper panel.
(3) Connect the RJ45 cable to the PU port of the inverter separately, and connect a 100Ω terminating resistor between the receiving signal terminals RDA and RDB of the inverter at the end of the network to eliminate the possibility of reflection due to signal transmission speed, transmission distance, etc. The communication barrier caused by the impact.
3. Mitsubishi Inverter Communication Parameter Setting In order to establish communication correctly, parameters related to communication such as “Station No.”, “Communication Rate”, “Stop Bit Length/Word Length”, “Parity”, etc. must be set in the inverter. Wait. The Pr.117~Pr.124 parameters in the Mitsubishi inverter are used to set the communication parameters. The parameter setting is performed on the PU port using the operation panel or the inverter setting software FR-SW1-SETUP-WE.
4. Mitsubishi inverter setting items and instruction code examples
(1) Communication method
The master-slave mode is used for communication between the PLC and the Mitsubishi inverter. The PLC is the master and the inverter is the slave. There is only one host in one network, and the host distinguishes different slaves by station number. They use half-duplex two-way communication, and the slave sends data only after receiving the host's read and write commands.
(2) PLC command specifications controlled by Mitsubishi inverter
(3) PLC statement table program example and comment of Mitsubishi inverter operation monitoring
LD M8000 operation monitoring;
EXTR K10 K0 H6F D0 EXTR K10: Operation monitor command; K0: station number 0; H6F: frequency code (see Table 1); D0: PLC read address (data register).
Explanation of the command: The PLC always monitors the speed (frequency) of the inverter with station number 0.
(4) Mitsubishi PLC statement table program example and comment of inverter operation control
The LD X0 run command is input by X0;
SET M0 sets the M0 auxiliary relay;
LD M0 EXTR K11 K0 HFA H02 EXTR K11: Operation control command; K0: Station number 0; HFA: Operation command H02: Forward command.
The execution of the AND M8029 instruction ends;
RST M0 resets the M0 auxiliary relay.
Explanation of the instruction: The PLC issues a forward rotation command to the inverter with station number 0.
(5) Example of PLC statement table program read by Mitsubishi inverter parameters and comments
The LD X3 parameter read command is input by X3;
SET M2 sets the M2 auxiliary relay;
LD M2 EXTR K12 K3 K2 D2 EXTR K10: Inverter parameter read command; K3: station number 3; K2: parameter 2 - lower limit frequency; D2: PLC read address (data register).
OR RST M2 resets the M2 auxiliary relay.
Explanation of the instruction: The PLC always reads the parameter No. 2 of the inverter of station number 3 - the lower limit frequency.
(6) Example of PLC statement table program written by Mitsubishi inverter parameters and comments
The LD X1 parameter change command is input by X3;
SET M1 sets the M1 auxiliary relay;
LD M1 EXTR K13 K3 K7 K10 EXTR K13: Mitsubishi inverter parameter write command; K3: station number 3; K7: parameter 7 - acceleration time; K10: value written.
EXTR K13 K3 K8 K10 EXTR K13: Mitsubishi inverter parameter write command; K3: station number 3; K8: parameter 8 - deceleration time; K10: value written.
The execution of the AND M8029 instruction ends;
RST M1 resets the M1 auxiliary relay.
Explanation of the command: The PLC changes the parameter No. 7 of the inverter of station No. 3 - acceleration time, parameter No. 8 - deceleration time to 10.