Emerson Micro Motion SGM - Page 92

Important
This table assumes that Discrete Output Polarity is set to Active High. If Discrete Output Polarity is set to
Active Low, reverse the voltage values.
10.3.2 Configure Discrete Output Polarity
ProLink III Device Tools → Configuration → I/O → Outputs → Discrete Output
Field communicator Configure → Manual Setup → Inputs/Outputs → Discrete Output → DO Polarity
Discrete outputs have two states: ON (active) and OFF (inactive). Two different voltage levels are used to
represent these states. Discrete Output Polarity controls which voltage level represents which state.
Procedure
Set Discrete Output Polarity as desired.
The default setting is Active High.
Options for Discrete Output Polarity
Polarity Description
Active High • When asserted (condition tied to DO is true), the circuit draws as
much current as it can, up to a maximum of 10 mA.
• When not asserted (condition tied to DO is false), the circuit draws
less than 1 mA.
Active Low • When asserted (condition tied to DO is true), the circuit draws less
than 1 mA.
• When not asserted (condition tied to DO is false), the circuit draws
as much current as it can, up to a maximum of 10 mA.
10.3.3 Configure Discrete Output Fault Action
ProLink III
Device Tools → Configuration → Fault Processing
Field communicator Configure → Manual Setup → Inputs/Outputs → Discrete Output → DO Fault Action
Discrete Output Fault Action controls the behavior of the Discrete Output if the transmitter encounters an
internal fault condition.
Note
For some faults only: If Fault Timeout is set to a non-zero value, the transmitter will not implement the fault
action until the timeout has elapsed.
CAUTION
Do not use Discrete Output Fault Action as a fault indicator. If you do, you may not be able to distinguish a
fault condition from a normal operating condition. If you want to use the Discrete Output as a fault
indicator, set Discrete Output Source to Fault and set Discrete Output Fault Action to None.
Integrate the meter with the control system Configuration and Use Manual
March 2021 MMI-20020954
92 Micro Motion Gas Specific Gravity Meters (SGM)