Delta Electronics Ethernet Communication Module DVPEN01-SL, Application of Modbus TCP Master

Ethernet Communication Module DVPEN01-SL

		TOP	K100	K86	H1064	K1
		TOP	K100	K14	K0	K1
		TOP	K100	K13	K1	K1
		SET	M2
		RST	M1
M2
		FROM	K100	K14	D14	K1
	= D14 K2
		RST	M2
	= D14 K3	RST	M2
		END

Explanations:

•The data exchange will be executed every one second.

•Write “0” into CR#28, and PLC_B will use CR#25 ~ CR#26 as the IP address of the destination PLC.

•Write the IP address of PLC_A into CR#25 and CR#26. The first two IP codes (192.168 = H’C0A8) should be written into CR#26, and the last two IP codes (0.4 = H’0004) into CR#25.

•Write the Modbus address of D0 (H’1000) in PLC_A into CR#81 and CR#84.

•Write the Modbus address of D100 (register of RTC) (H’1064) into CR#86.

•Write the number of registers K7 into CR#85.

•Write “1” into CR#13 to start the data exchange.

•CR#14 = 2 refers to successful execution. CR#14 = 3 refers to failed execution.

•Once the data exchange is successful, the values in D1313 ~ D1318 in PLC_B will be written into D0 ~ D6 of PLC_A.

6.12Application of Modbus TCP Master (1)

Application

Network requirement

Compiling Modbus instrcution by PLC_B, making Y0 of PLC_A flashing

(1)Adopting static IP.

(2)IP of PLC_A: 192.168.0.4

(3)IP of PLC_B: 192.168.0.5

(4)Update from PLC_B to PLC_A

(5)Use Modbus instrcution 050500FF00 to set “On” Y0.

(6)Use Modbus instrcution 0505000000 to set “Off” Y0.

(7)Y0 goes between On/Off once every one second.

1.See 6.1 for how to set up the communication.

2.Compile the ladder diagram in the MPU and download it to PLC_B. See below for the program design. We do not need to write any corresponding ladder diagram into PLC_A.

DVP-PLC Application Manual 49