SECTION 9. INPUT/OUTPUT INSTRUCTIONS

PARAM.

DATA

 

NUMBER

TYPE

DESCRIPTION

01:

2

Repetitions

02:

2

Range Code (Table 9-

 

 

1)

03:

2

Single-ended channel

 

 

number

04:

2

Excitation channel

 

 

number

05:

4

Excitation voltage

 

 

(millivolts)

06:

4

Input location number

 

 

for first measurement

07:

FP

Multiplier

08:

FP

Offset

Input locations altered: 1 per measurement

*** 6 FULL BRIDGE WITH SINGLE ***DIFFERENTIAL MEASUREMENT

FUNCTION

This Instruction is used to apply an excitation voltage to a full bridge and make a differential voltage measurement of the bridge output. The measurement is made with the polarity of the excitation voltage both positive and negative (Figure 13.5-1). The result is 1000 times the ratio of the measurement to the excitation voltage. A 1 before the excitation channel number (1X) causes the channel to be incremented with each repetition.

PARAM.

DATA

 

NUMBER

TYPE

DESCRIPTION

01:

2

Repetitions

02:

2

Range code (Table 9-1)

03:

2

Differential channel

 

 

number for first

 

 

measurement

04:

2

Excitation channel

 

 

number

05:

4

Excitation voltage

 

 

(millivolts)

06:

4

Input location number

 

 

for first measurement

07:

FP

Multiplier

08:

FP

Offset

Input locations altered: 1 per measurement

9-4

*** 7 THREE WIRE HALF BRIDGE ***

FUNCTION

This Instruction is used to determine the ratio of the sensor resistance to a known resistance using a second voltage sensing wire from the sensor to compensate for lead wire resistance.

The measurement sequence is to apply an excitation voltage, make two voltage measurements on two adjacent single-ended channels, the first on the reference resistor and the second on the voltage sensing wire from the sensor (Figure 13.5-1), then reverse the excitation voltage and repeat the measurements. The two measurements are used to calculate the resulting value, which is the ratio of the voltage across the sensor to the voltage across the reference resistor. A 1 before the excitation channel number (1X) causes the channel to be incremented with each repetition.

PARAM.

DATA

 

NUMBER

TYPE

DESCRIPTION

01:

2

Repetitions

02:

2

Range code for both

 

 

measurements (Table

 

 

9-1)

03:

2

Single-ended channel

 

 

number for first

 

 

measurement

04:

2

Excitation channel

05:

4

Excitation voltage

 

 

(millivolts)

06:

4

Input location number

 

 

for first measurement

07:

FP

Multiplier

08:

FP

Offset

Input locations altered: 1 per measurement

*** 8 DIFFERENTIAL VOLTAGE WITH ***EXCITATION AND DELAY

FUNCTION

This measurement consists of applying a single excitation voltage, delaying a specified time, and making a differential voltage measurement. The result stored is the voltage measured.

"Delay" (Parameter 5) refers to increasing the signal settling time by increasing the time between the start of excitation and the start of signal integration (Section 13.2). If a delay of 0