Pepperl+Fuchs AS-I 3.0, Руководство пользователя

Страница: 24 / 177

Is
s
u
e
d
a
te
:
7
.6
.2
0
1
3
24
AS-i 3.0 Command Interface
Commands of the Command Interface
4.3 Acyclic commands
4.3.1 Overview of the commands
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_75_PARAM, WR_74_75_PARAM, RD_74_75_ID,
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.
Values for command
see page Command Value Meaning Req
Len Res
Len
page 24 WRITE_ACYC_TRANS 4E
16
write acyclic transfer
≥
7 2
page 27 READ_ACYC_TRANS 4F
16
read acyclic transfer 5
≥
2
Tab. 4-31.
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!