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Transmitter Configuration and Use: Series 1000 and 2000 Transmitters 65

Required Transmitter Configuration continued

Required Configuration Optional ConfigurationUsing the TransmitterFlowmeter Startup

Figure 6-12 Discrete output circuit

The discrete outputs can be used to indicate the conditions described in Table 6-15. If you have two

discrete outputs, you can configure them independently; for example, you can assign one to flow

switch and the other to fault.

Table 6-14 Discrete output polarity

Polarity

Output power

(1) On AN transmitters, all outputs are internally powered. On IS transmitters, all outputs are externally powered. On CIO transmitters,

the two channels which can be configured as discrete outputs (Channels B and C) can be configured for either internal or external

power (see Section 6.3.1).

Description

Active high Internal • When asserted (condition tied to DO is true), the circuit provides a pull-up

to 24 V (AN transmitters) or 15 V (CIO transmitters).

• When not asserted (condition tied to DO is false), the circuit provides 0 V.

External • When asserted (condition tied to DO is true), the circuit provides a pull-up

to a site-specific voltage, maximum 30 V.

• When not asserted (condition tied to DO is false), the circuit provides 0 V.

Active low Internal • When asserted (condition tied to DO is true), the circuit provides 0 V.

• When not asserted (condition tied to DO is false), the circuit provides a

pull-up to 24 V (AN transmitters) or 15 V (CIO transmitters).

External • When asserted (condition tied to DO is true), the circuit provides 0 V.

• When not asserted (condition tied to DO is false), the circuit provides a

pull-up to a site-specific voltage, to a maximum of 30 V.

24 V (Nom) (AN transmitters)

15 V (Nom) (CIO transmitters)

Out+

Out–

3.2 Kohm

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Emerson MICRO MOTION 2700 Installationshandbuch Seite 75