Acyclic Commands; Overview Of The Commands; Write_Acyclic_Trans - Pepperl+Fuchs AS-I 3.0 Manual

AS-i 3.0 Command Interface
Commands of the Command Interface
4.3

Acyclic commands

4.3.1

Overview of the commands

Values for command
see page Command
page 24 WRITE_ACYC_TRANS
page 27 READ_ACYC_TRANS
4.3.2

WRITE_ACYCLIC_TRANS

This function starts various types of acyclic transfer (S-7.4, S-7.5 and Safety
Monitor). The transfer is performed in the background. The result must be read
using READ_ACYC_TRANS. The function is intended to be a replacement for
the functions
RD_74_DIAG and "Safety at Work" monitor diagnostic), as it runs in the back-
ground and does not stop the AS-i master during the transfer.
As the data to be transferred can be longer than the command interface, the data
is first written to a buffer in sections before the transfer is started.
n is the length of the sub-string that is to be written to the buffer starting from in-
dex (i). When i = 0, the transfer is started.
Information
See <table 4-33> for an overview of the acyclic transfer commands and the supported
monitor types.
Attention!
Don`t execute acyclic commands via multiple command interfaces simultane-
ously!
24
Value Meaning
4E write acyclic transfer
16
4F read acyclic transfer
16
(RD_74_75_PARAM, WR_74_75_PARAM,
Req Res
Len Len
2
≥7
5
≥2
Tab. 4-31.
RD_74_75_ID,