Reference Manual
00809-0100-4841, Rev. AA
May 2007
4-43
Rosemount 3490 Series
Table 4-11. Relay Modes
Relay Mode Purpose of Relay Mode
Auxiliary
functions
(Table 4-12)
"None" Relay is not used No
"Set point SV" On/Off Point Control using SV (D801).
(See Section “On/Off Point Control“ on page 4-42).
Yes
"Set point TV" On/Off Point Control using TV (D802).
(See Section “On/Off Point Control“ on page 4-42).
Yes
"Set point FV" On/Off Point Control using FV (D803).
(See Section “On/Off Point Control“ on page 4-42).
Yes
"Assist" Duty Assist - On/Off Point Control
(See “On/Off Point Control“ on page 4-42)
and Auto Sequence
(See “Auto-Sequence (Models 3491 and 3492 only)“ on
page 4-53).
Yes
"Stby com off" Duty Standby, Common Off
(See “Standby, Common Off Relay“ on page 4-46)
and Auto Sequence
(See “Auto-Sequence (Models 3491 and 3492 only)“ on
page 4-53).
Yes
"Stdby split off" Duty Standby, Split Off
(See “Standby, Split Off Relay“ on page 4-49)
and Auto Sequence
(See “Auto-Sequence (Models 3491 and 3492 only)“ on
page 4-53)
Yes
"Digital Input 1" Relay energises while Digital Input 1 (IN1) is active. Yes
"Digital Input 2" Relay energises while Digital Input 2 (IN2) is active. Yes
"Sampler" Relay outputs sampler pulses.
(See “Sampler Relay“ on page 4-52
No
"RoC" Relay is energised if the Rate of Change of the PV is
out-of-limits
(See “Rate of Change Relay“ on page 4-53).
Yes
"Digital input 1+2" Relay is energised while Digital Input 1 (IN1) and 2 (IN2)
are both active
Yes
"Off" Relay is always de-energised No
"Set Point" On/Off Point Control using PV (D800)
(See Section “On/Off Point Control“ on page 4-42). No
auto sequencing.
Yes
"Desludge" To set-up the de-sludge operation, use the section
“Custom“ on page 4-55.
Yes
"Alarm" Relay is allocated to alarm indication duty - see Section
“About Alarms“ on page 4-60 for details of alarm handling.
Yes
"Totaliser" Relay outputs totaliser pulses. (model 3491 only)
(See Section “Totaliser Relay“ on page 4-52).
No
"Totaliser 1" Relay outputs totaliser 1 pulses (models 3492/3493 only).
(See Section “Totaliser Relay“ on page 4-52).
No
"Totaliser 2" Relay outputs totaliser 2 pulses (model 3492/3493 only).
(See “Totaliser Relay“ on page 4-52).
No
"Fault" Indicate fault condition by de-energising relay
(See “Fault Relay“ on page 4-52).
No
"Cleaning" To set-up a cleaning operation, use section “Custom“ on
page 4-55.
No
"PV limits" Relay energises while PV value (D800) is within limits.
(See “PV limits Relay“ on page 4-53).
Yes
"On" Relay is always energised No
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