Delta DVP-ES2/EX2/SS2/SA2/SX2/SE Mnemonic Operands Function Controllers Serial Communication

3. Instruction Set

API	Mnemonic	Operands	Function	Controllers
80	RS		Serial Communication	ES2/EX2	SS2	SA2 SX2
						SE

Type

Bit Devices

Word devices

Program Steps

OP

X

Y

M

S

K

H

KnX

KnY

KnM

KnS

T

C

D

E

F

RS: 9 steps

S

*

m

*

*

*

D

*

n

*

*

*

16-bit

PULSE

32-bit

ES2/EX2

SS2

SA2

SX2

ES2/EX2

SS2

SA2

SX2

ES2/EX2

SS2

SA2

SX2

SE

SE

SE

Operands:

S: Start device for data to be sent m: Length of data to be sent (m = 0~256)

D: Start device for

data to be received n: Length of data to be received (n = 0~255)

Explanations:

1.RS instruction is used for data transmitting and receiving between PLC and external/peripheral equipment (AC motor drive, etc.). Users have to pre-store word data in registers starting from S, set up data length m, specify the data receiving register D and the receiving data length n.

2.RS instruction supports communication on COM1 (RS-232), COM2 (RS-485) and COM3 (RS-485, ES2/EX2/SA2). (COM3 is only applicable to DVP-ES2/EX2/SA2/SE, and is not applicable to DVP-ES2-C.)

3.Designate m as K0 if data sending is not required. Designate n as K0 if data receiving is not required.

4.Modifying the communication data during the execution of RS instruction is invalid.

5.There is no limitation on times of using this instruction, however, only 1 instruction can be executed on one communication port at the same time..

6.If the communication format of the peripheral device is Modbus, DVP series PLC offers handy communication instructions MODRD, MODWR, and MODRW, to work with the device.

7.If the connected peripheral devices are Delta VFD series products, there are several communication instructions available including FWD, REV, STOP, RDST and RSTEF.

Program Example 1: COM2 RS-485

1.Write the data to be transmitted in advance into registers starting from D100 and set M1122 (Sending request) as ON.

2.When X10 = ON, RS instruction executes and PLC is ready for communication. D100 will then start to send out 10 data continuously. When data sending is over, M1122 will be automatically reset. (DO NOT apply RST M1122 in program). After approximate 1ms, PLC will start to receive 10 data and store the data in 10 consecutive registers starting from D120.

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