ProSoft Technology AN-X-PB - Manual (Page 49)

AN-X-PBSLV Page 43
January 2008
Unscheduled Messages
You can use unscheduled messages to access the PROFIBUS data
directly on the AN-X-PBSLV:
•
directly, from a computer or PLC, by sending messages
•
from a DDE or OPC server, such as RSLinx
•
from an HMI such as RSView or Wonderware InTouch, using
the appropriate driver
PCCC/PLC-5 Files
The module "emulates" PLC-5 integer files.
The AN-X-PBSLV supports Word Range read/write, Typed read/write,
Read/Modify/Write, and PLC-3 Bit Write messages, with both logical
ASCII and logical binary addressing.
Data is mapped in two different ways – on a node-by-node basis and
packed into blocks.
Node-by-node Mapping
The node-by-node mapping is more convenient for obtaining data for a
given node but is less efficient. It requires a separate read to obtain data
for each node.
PLC-5 Files Description
N200-N325 Node 0-125 Outputs from PROFIBUS master
N400-N525 Node 0-125 Inputs to PROFIBUS master (active nodes
only)
N600-N725 Node 0-125 Inputs to PROFIBUS master (monitored
nodes only)
Packed Mapping
The packed mapping is more efficient – the data is packed into a small
number of files, but processing is required to extract the data for any
specific node. Also, if the configuration changes, the addresses for the
data for each node will change.
PLC-5 Files Description
N20-N39 Node 0-125 Outputs from PROFIBUS master
N40-N59 Node 0-125 Inputs to PROFIBUS master (active nodes