Ross Controls ROSS MODULAR I - Manual (Page 39)

39 www.rosscontrols.com
For These Features Remember Select
Behaves as a slave device on the Main Network and a
master on the PointBus.
Allows a group of I/O modules on the Subnet to act as
a single node on the Main Network.
RSNetWorx™ for DeviceNet™ software is
needed for configuration of the RPSSCDM12A
or RPSSCDM18PA on the Main Network and the
PointBus Configuration on the PointBus consists of a
scan list that is very similar to those used in all of the
DeviceNet™ master scanner modules.
All Serial Bus modules count as a
single node on the Main Network.
The Main Network distance is
acceptable.
Serial Bus expansion power supplies
are permitted to add more Serial Bus
modules.
RPSSCDM12A (M12-style network
connectors).
RPSSCDM18PA (mini-style network
connectors with pass-through).
Selecting the DeviceNet™
Communication Interface
Serial Bus offers two interfaces for connecting to
DeviceNet™. Refer to the following table.
It is important that the total amount of data coming from
the Subnet does not exceed the data capability of either
the RPSSCDM12A or RPSSCDM18PA.
• 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
Selecting a Network
You can configure your system for information exchange
between a range of devices and computing platforms and
operating systems.
Application Requirements Network Select
• Plant management (material handling)
• Configuration, data collection, and control on a single, high-speed network
• Time-critical applications with no established schedule
• Data sent regularly
• Internet/Intranet connection
EtherNet/IP™ RPSSCENA
• High-speed transfer of time-critical data between controllers and I/O devices
• Deterministic and repeatable data delivery
• Media redundancy
• Controller redundancy
• Intrinsic safety
• Redundant controller systems
ControlNet™ RPSSCCNA
• Connections of low-level devices directly to plant-floor controllers, without interfacing them
• Data sent as needed
• More diagnostics for improved data collection and fault detection
• Less wiring and reduced start-up time than a traditional, hard-wired system
DeviceNet™
RPSSCDM12A
RPSSCDM18PA
• Connecting to an existing PROFIBUS DP 5m bus,12 MB network PROFIBUS RPSSCPBA
The data coming through the RPSS 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 RPSSCDM12A or
RPSSCDM18PA adapters.
Serial Bus System