Chapter 10 Deployment CPU 21xSER-2 Manual VIPA CPU 21x
10-8 HB103E - Rev. 05/45
Communication
Data communication is controlled by means of the handler blocks.
The CPU decides the type of data transfer depending on the
parameterization. The standard modes use the SEND/RECEIVE blocks for
order initialization and the "ALL" blocks for the user data communication.
The following blocks are supplied:
SFC Label
SFC 235 SYNCHRON Synchronization between CPU and CP and
presetting of the block size
SFC 230 SEND Initialize a send order
SFC 236 SEND-ALL Send user data
SFC 231 RECEIVE Initialize a receive order
SFC 237 RECEIVE-ALL Receive user data
SFC 233 CONTROL Block for communication control
SFC 234 RESET Deletes all orders and activates new
parameter
The following text shows the approach of programming in easy steps:
Start-up OB100:
• Call SYNCHRON with SFC 235 and enter the wanted block size (Page
frame basic address=0, Block size, PAFE)
• Parameterize the interfaces with SEND (SFC 230) with order no. 201
and parameter DB
• To take over the parameters, you call RESET (SFC 234) with order no. 0
Cycle OB1:
• Create SEND and RECEIVE orders for send and receive initialization
• Create SEND ALL and RECEIVE ALL orders for user data transfer
A more detailed description follows.
Overview
Programming
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