Delta Electronics Programmable Logic Controller DVP-PLC User Manual

Page 366

7 Application Instructions API 50-99

D V P - P L C A P P L I C AT I O N M A N U A L

7-82

D120L

D122L

D123L

D124L

D125L

D126L

D121L

Head

code

Tail code

received data register, starting from

the lower 8 bits of D120

length = 7

When receiving data, PLC will receive the head code and tail code of the data from the external equipment;

therefore, the user has to be aware of the setting of data length n.

2. 16-bit

mode:

The head code and tail code of the data are set up by M1126 and M1130 together with D1124 ~ D1126. When

PLC is executing RS instruction, the head code and tail code set up by the user will be sent out automatically.

M1161 = Off indicates PLC in 16-bit conversion mode. The 16-bit data will be divided into the higher 8 bits and

lower 8 bits for data transmission.

M1001

M1161

D100

D120

Sending data: (PLC -> external equipment)

STX

D100L

D101L

ETX1

ETX2

Head

code

source data register, starting from
the lower 8 bits of D100

length = 4

Tail code

Receiving data: (External equipment -> PLC)

D120L

D120H

D121L

D121H

D122L

D122H

D123L

Tail code

received data register, starting from
the lower 8 bits of D120

length = 7

Head

code

When receiving data, PLC will receive the head code and tail code of the data from the external equipment;

therefore, the user has to be aware of the setting of data length n.

Program Example 3:

Connect PLC to VFD-B series AC motor drives (AC motor drive in ASCII Mode; PLC in 16-bit mode and M1161 = Off).

Write in the 6 data starting from parameter address H2101 in VFD-B in advance as the data to be transmitted.