FC 31 - Test Quality

The test quality function code checks the point quality of up to four inputs. It is a four input logical OR function that sets the output to a logic 0 if all tested points are good, and to a logic 1 if one or more tested inputs are bad.

 

Analog and digital I/O and Cnet inputs can be tested for quality. Quality is not propagated through module function blocks.

All internal points will have good quality.

 

Outputs:

Blk

Type

Description

N

R

Point quality:

0 = all inputs good

1 = at least 1 input bad

 

 

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 # 1

S3

N

0

I

Note 1

Block address of input # 1

S4

N

0

I

Note 1

Block address of input # 1

 

NOTES:

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

2. It has been shown that if 2 or more input specs to the Test Quality Function Code are tied to the same block address, it can cause the BRC type modules to trip.

 

31.1  Applications

 

The example shown in Figure 31-1 shows four analog points transferred from Controlway addresses three, four, five and seven into Controlway address six. The test quality block checks the point quality of all four analog points. If one or more of the points are bad quality, the output of the test quality block (block 220) is a logic 1. When all points are good, the output is a logic 0.