Omron DR 170 14 - Manual (Page 49)

Klinkmann Automation Omron Ethernet DAServer 47
Omron Ethernet DAServer Ver 1.x User Manual Rev 1.3 17014m13
DAServer Device-Group-Specific System Items
The following system items refer to specific information regarding device groups that have
been configured in the DAServer.
System Item
Name
Type/
Access
Rights
Description Values
$SYS$UpdateInterval DWord/
ReadWrite
Used to access the currently
set update interval. It is the
current update interval of the
device group in milliseconds.
A client can poke new values
into this item.
The value of zero indicates
that no non-system items on
that topic are updated (data
for these items are not
acquired from the device). RANGE:
1…2147483647
0: Topic inactive,
no items are
updated. Data
acquisition is
stopped.
>0: Expected
updated interval
for the set of all
items in the
device group.
$SYS$MaxInterval DWord/
Read
Used to access the currently
measured maximum update
interval in milliseconds of all
items of the corresponding
device group. This item is
read-only. The value of the
slowest item is displayed.
RANGE:
0…2147483647
0: If update
interval is 0 or if
the status is
false.
>0: Measured
update interval
$SYS$WriteComplete Integer/
ReadWrite Used to access the state of
pending write activities on the
corresponding device group.
On device group creation
(adding items to an OPC
group), the value of this
system item is initially 1,
indicating all write activities
are complete – no pokes are
pending.
If values are poked into any
items of the device group, the
value of this item changes to
0, indicating write activity is
currently in progress.
If the server has completed all
write activities, the value of
this item changes to 1 if all
pokes were successful or to -1
if at least one poke has failed.
If the value of this item is not
zero, the client can poke 1 or -
1 to it (poke a 1 to clear errors, RANGE: -1, 0, 1
1: Write
complete (no
writes are
pending – initial
state).
0: Writes are
pending.
-1: Writes
completed with
errors.