FC 36 - Qualified OR (8 - Input)

The qualified OR function code monitors the status of up to eight digital inputs and produces an output signal based upon conditions set by S9 and S10. The output is a logic 1 or 0 and is based upon the number of inputs being less than, equal to, or greater than the number specified in S9 and the condition set by S10.

 

Outputs:

Blk

Type

Description

N

R

Output equals:

Logic 0 when:

No. of logic 1 inputs < S9

 

Logic 1 when:

S10 = 0 and no. of logic 1 inputs > S9

or

S10 = 1 and no. of logic 1 inputs = S9

 

 

Specifications:

Spec

Tune

Default

Type

Range

Description

S1

N

0

I

Note 1

Block address of input # 1

S2

N

0

I

Note 1

Block address of input # 2

S3

N

0

I

Note 1

Block address of input # 3

S4

N

0

I

Note 1

Block address of input # 4

S5

N

0

I

Note 1

Block address of input # 5

S6

N

0

I

Note 1

Block address of input # 6

S7

N

0

I

Note 1

Block address of input # 7

S8

N

0

I

Note 1

Block address of input # 8

S9

N

0

I

0 - 8

Number of inputs that must equal logic 1

S10

N

0

B

0 or 1

Select inputs:

0 = no. of logic 1 inputs > S9

1 = no. of logic 1 inputs = S9

 

NOTES:

1. Maximum values are: 9,998 for the BRC-100, IMMFP11/12 and 31,998 for the HAC

 

36.1  Applications

 

This function can monitor a group of devices to determine if a certain number of the devices are operational at any given time. Figure 36-1 illustrates the use of function code 36 to monitor the number of pumps running and limit demand when less than two are operational. The output of the qualified OR block serves as a transfer signal for an analog transfer block.

 

If less than two pumps are running, the output of the analog transfer block will be the constant identified in the manual set constant block, and if two or more pumps are running, the output equals the input from the process.