User manual

Klinkmann Automation SPA Bus Server 31
SPA Server Ver 1.x User Manual Rev 2.3 120XXM23
Clicking on this button initiates the browsing through exposed address space of SPA
Server. The starting addresses of each available data area and names of pre-defined
(additional) items will appear on “Browse OPC items:” window in alphabetical order.
Accessing SPA Items via the OPCLink Server
The communication protocol addresses an element of data in a conversation that uses a
three-part naming convention that includes the application name, topic name and item
name. The following briefly describes each portion of this naming convention:
application name
The name of the Windows program (server) that will be accessing the data element. In
the case of data coming from or going to SPA Server “OPC & DDE” version, the
application portion of the address is OPCLINK.
topic name
Meaningful names are configured to identify specific devices. These names are then
used as the topic name in all conversations to that device. This must be same name as
Topic Name entered in the “OPCLink Topic Definition” dialogue box, for example,
Controller1.
Note. You can define multiple topic names for the same SPA device to poll different
points at different rates.
item name
A specific data element within the specified topic. The OPCLink Server item syntax
follows the following rules. The item names must start with:
d – discrete value
i – integer value
r -- real value
m – message
The item name that added to the OPC path of the topic (without the heading type letter)
must give a fully qualified OPC item name for the SPA Server. Some examples of
possible item names acceptable by OPCLink Server/ SPA Server connection:
ivi0.200 – integer variable 200, channel 0
did1.1 – discrete input 1, channel 1