FC 84 - Digital Input Group

The digital input group function code reads a group of eight inputs from an IMDSI12, IMDSI13, IMDSI14, IMDSI15, or IMDSI22 digital module.

 

To insure that the signals successfully transfer across the controlway/module bus, the signal generates a point quality flag.  To test the quality of the signal, include a function code 31 in the configuration. The quality of the signal cannot be determined by any other type of block. However, the output of the test quality block can be used as an input to other digital processing blocks to provide signal quality information.  Refer to Appendix H, for a definition of point quality.  

 

The control system must be carefully evaluated to establish

default values that will prevent personal injury and/or

property damage in the case of module failure.

 

 

 

 

Outputs:

Blk

Type

Description

N

B

Output 1 with quality

N+1

B

Output 2 with quality

N+2

B

Output 3 with quality

N+3

B

Output 4 with quality

N+4

B

Output 5 with quality

N+5

B

Output 6 with quality

N+6

B

Output 7 with quality

N+7

B

Output 8 with quality

 

 

Specifications:

Spec

Tune

Default

Type

Range

Description

S1

N

0

I

0 - 63

Expander bus I/O module address

S2

N

0

I

0 or 1

Input group:

0 = inputs 1 - 8, group A

1 = inputs 9 - 16, group B

S3

N

0

I

0 or 1

Action on I/O module failure:

0 = trip control module

1 = continue to operate

 

84.1 Explanation

 

84.1.1 Specifications

 

S1 - SLVADR

I/O module associated with this block (zero through 63).

 

S2 - GROUP

Input group. Digital I/O modules can handle two groups of eight inputs. Input group is identified by the following:

0 = inputs 1 through 8

1 = inputs 9 through 16

 

S3 - TRIP

Defines the action of the control module in the event of I/O module failure.

0 = trip control module

1 = continue operation