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Reference Manual
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Appendix C: DeltaV ready
April 2013
Appendix C
Delta V ready
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 67
Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 67
Mounting and connecting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 68
Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 68
C.1
Overview
Native integration with DeltaV enables the Smart Wireless Gateway to be autosensed and easily
commissioned for seamless integration with all DeltaV applications: Explorer, Diagnostics, and
Control Studio. WirelessHART devices can be easily added to the wireless field network and then
reconciled through DeltaV Explorer and assigned to analog channels through drag and drop
assignment.
C.2
Latency considerations in control logic design and
operation
Since the DeltaV wireless I/O scanner software requests updates for 1/5 of the devices each
second, DeltaV receives updates on a particular field device once every 5 seconds. That is not
necessarily synchronized with the update rate of the field device. Also, there is some latency
between when the field device takes a process sample and when it is permitted to pass its value
onto the wireless network. Status update responses can also increase latency in some instances.
So for example, if a device updates once every 8 seconds, and wireless network latency is 2
seconds, the amount of time that could pass between when an event occurred in the field and
before it is available to the DeltaV I/O bus is between zero and 15 (8+2+5) seconds. The update
period of the DeltaV control module should be added to that total to determine the range of
latencies before an event in the field can be acted upon by the control system.
Operators should be made aware that the update rate of wireless measurements on operator
screens are somewhat slower than those from wired devices. For example, if the operator
initiates a valve movement, it can be 5-15 seconds before confirming feedback appears on the
operator screen. Any control logic designed along the same principles should also take the
update rates and latencies into account as well.
C.3
Requirements
DeltaV:
Version 10.3 or newer.
Smart Wireless Gateway:
DeltaV Ready option (Data Protocol option 5). Appendix A: Ordering Information
Summary of Contents for Smart Wireless Gateway
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