Publication 1756-UM514B-EN-P - February 2003
Using the 1756-DHRIO Module in Remote I/O Applications 8-15
Adapter Module I/O Update Rate with the 1756-DHRIO Module in
the Remote Chassis
When the 1756-DHRIO module resides in the remote chassis from the
owner-controller, updated output data (refreshed to new values via
the control program) is delivered to the adapter module at:
RPI + (scan rate per adapter * number of adapters) + 2(NUT)
The updated input data is delivered to the ControlLogix controller at:
(scan rate per adapter * number of adapters) + 2(NUT)
The update rate for an adapter module (i.e. the rate at which I/O data
is produced/consumed between the owner-controller and the
1756-DHRIO module) is:
RPI + 2(scan rate per adapter * number of adapters) + 4(NUT)
This is a turnaround calculation for an output to input in the
same rack.
When you include block transfers, the update rate for an adapter
module is:
RPI + 2(scan rate per adapter * number of adapters) + (Scan rate
per adapter * total number of adapters with BT modules in
them) + 4(NUT)
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