Emerson Process Management 1500 9 Discrete output polarity, Required Transmitter Configuration

Required Transmitter Configuration

Table 4-9Discrete output polarity

Polarity	Output power supply	Description
Active high	Internal	• When asserted, the circuit provides a pull-up to 15 V.
		• When not asserted, the circuit provides 0 V.
	External	• When asserted, the circuit provides a pull-up to a site-specific
		voltage, maximum 30 V.
		• When not asserted, circuit provides 0 V.
Active low	Internal	• When asserted, the circuit provides 0 V.
		• When not asserted, the circuit provides a pull-up to 15 V.
	External	• When asserted, the circuit provides 0 V.
		• When not asserted, the circuit provides a pull-up to a site-specific
		voltage, to a maximum of 30 V.

Figure 4-8Discrete output circuit 15 V (Nom)

3.2 Kohm

Out+

Out–

The discrete outputs can be used to indicate a fault, to indicate filling in progress, or to control the primary or secondary valves, as described in Table 4-10.

Note: Before you can assign a discrete output to valve control, the Fill Type parameter must be configured. See Chapter 7 and Figure 7-3.

Before You Begin

Using ProLink II

Flowmeter Startup

Required Configuration

Configuration and Use Manual 27