AC 80 User’s Manual 4-31
PC Elements
The AFTRA and MB90TRA elements are used for sending data
cyclically over the AF 100. The data types are determined by the call
parameters; the alternatives are I, IL and R. The transmitted data is
updated to the AF 100 bus coupler memory each time the element is
executed, and sent onto the bus as set with the SCAN terminal.
The AFREC and MB90REC elements are used for receiving data from
the AF 100. The data types are determined by the call parameters; the
alternatives are I, IL and R.
Note that the IDENT number on the transmitting and receiving
elements must match.
Figure 4-23 The AFTRA and AFREC PC elements.
The difference between AFxxx and MB90xxx elements is in the way
they handle short integer data. For more information, see the
AC 80 PC Elements Reference Manual.
Received Data
Data to be Transmitted
Dataset Identification
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