Parker H Series, Installation & Service Instructions Manual

Page: 272 / 344

Publication PSS-SG001A-EN-P – June 2005
4 Isysnet
With the introduction of the PSSS23A module, the amount of
data to be transferred over the Subnet could become
substantial. It is important that the total amount of data coming
from the Subnet does not exceed the data capability of either
the PSSCDM12A or PSSCDM18PA.
• 250 bytes (248 data + 2 bytes command info) for output data
(used as either COS, cyclic, or poll)
• 250 bytes (248 data + 2 bytes status info) for polled input
data
• 250 bytes (248 data + 2 bytes status info) for COS/cyclic
input data
• 8 bytes (6 data + 2 status info) for strobe input data
The data coming through the PSS adapter combined with the
other data from the Main Network cannot exceed the data
capability of the Main Network master scanner. If this occurs,
you will need multiple master scanners on the Main Network
and the I/O modules on the Subnet will need to be split
between multiple PSSCDM12A or PSSCDM18PA adapters.