Rockwell-automation 1775-KA PLC-3 Communication Adapter Module User Ma Manual do Utilizador descarregar pdf (Página 213)

Detailed Flowcharts

Appendix D

D3

Figure D.3

Receiver

Routine for Full-Duplex Protocol

RCVE

GET BUFFER

Get a Buffer

LAST = NAK

Reset Receiver Error Flag

GET CODE

Get Next Input

DLE STX

XMSG

Transfer Message to

Network Layer

Ignore

Flag (0)

Save Response (ACK or

NACK) in LAST

SEND CTL

Transmit

LAST

Yes

NOTE: XMSG Returns ACK,

NACK, or 0 (for Ignored Message)

Variables:

• LAST: Value of Last Response

• HEADER: DST, SRC, CMD, STS

and TNS from last message

• BUFFER: Whether an Empty Buffer is Read

• Receiver error flag

10073–I

Reset Buffer Flag; Set

Header to Illegal Value

Control

Code

DLE ENQ

1 2 ... 208 209 210 211 212 213 214 215 216 217 218 ... 238 239

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Rockwell-automation 1775-KA PLC-3 Communication Adapter Module User Ma Manual do Utilizador Página 213