Rockwell Automation 1336T PLC Comm. Adapter, Series B, FRN 2.xx-3.xx - Manual (Page 62)

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Publication 1336 FORCE–5.13 –– September, 1998
When you configure both channel A and channel B for RIO
communications, you need to decide whether both channels will act
independently or if one channel will act as a back up for the other
channel, which is referred to as RIO redundant mode. If you want
both channels to act independently, set both channels to RIO
communications, but do not set the DIP switch settings for the
redundant mode.
By using RIO redundant mode, you can connect the drive to the RIO
channel of two separate PLC controllers. Parameter 427 specifies
which PLC controller (channel A or B) has control of the drive.
Output image table data from the non-controlling PLC is discarded.
However, if the protocols for both channels is set to RIO adapter
with block transfer, then block transfer requests are accepted from
both channels.
To use the RIO redundant mode, you need to:
•
Configure both channel A and channel B for the RIO protocol.
•
Set the DIP switch for channel A for the redundant mode.
•
Configure both channel A and channel B for the same size. For
example, both channels must be configured for a full, 3/4, 1/2, or
1/4 rack.
Output data from the drive is sent to both PLCs.
Using RIO Redundant
Mode