Emerson Process Management 1500 manual 9 Configuring the discrete outputs, Assignment, Condition

Required Transmitter Configuration

WARNING

Upon transmitter startup or abnormal power reset, any external device controlled by a discrete output may be momentarily activated.

Upon transmitter startup or abnormal power reset, discrete output states are unknown. As a result, an external device controlled by a discrete output may receive current for a brief period.

When using Channel B as a discrete output:

•You can prevent current flow upon normal startup by setting Channel B polarity to active low.

•There is no programmatic method to prevent current flow for Channel B upon abnormal power reset. You must design the system so that a brief current flow to the external device controlled by Channel B cannot cause negative consequences.

When using Channel C as a discrete output, there is no programmatic method to prevent current flow upon either transmitter startup or abnormal power reset. You must design the system so that a brief current flow to the external device controlled by Channel C cannot cause negative consequences.

Table 4-10Discrete output assignments and output levels

Assignment	Condition	Discrete output level(1)
Primary valve (DO1 only)	Open	Site-specific
Secondary valve (DO2 only)
	Closed	0 V
Fill in progress (DO2 only)	ON	Site-specific
	OFF	0 V
Fault indication (DO2 only)	ON	Site-specific
	OFF	0 V

(1)Voltage descriptions in this column assume that Polarity is set to Active High. If Polarity is set to Active Low, the voltages are reversed.

To configure the discrete output, see the menu flowchart in Figure 4-9.

Figure 4-9Configuring the discrete output(s)

ProLink Menu

Configuration

Discrete IO

Discrete output

·DO1 assignment

·DO1 polarity

·DO2 assignment

·DO2 polarity

Discrete input

· DI assignment

28 Micro Motion® Model 1500 Transmitters with the Filling and Dosing Application