FC 26 - Analog Input / Loop

The analog input/loop function code acquires analog signals via the communication highway in the same control network.  The input points are located in other Harmony control units (HCUs) and must have an exception report defined (e.g., analog exception report, function code 30). Updates are on an exception report basis. Exception report intervals are specified in the executive block or the segment control block. Use function code 121 for communication to other control networks. To insure that the signal is successfully acquired from the Controlway/module bus, the analog 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 point cannot be used as an input to any other type of block. However, the output of the test quality block, representing the quality, can be used as an input to other analog processing blocks.  Refer to Appendix H, for a definition of point quality.

 

Use function code 69 to test the alarm associated with the analog input/loop function block.

 

Outputs:

Blk

Type

Description

N

R

Analog Output Value

 

 

Specifications:

Spec

Tune

Default

Type

Range

Description

S1

N

0

I

0-31

Requested module address

S2

N

0

I

Note 1

Requested block address

S3

N

0

I

Note 2

Requested node address

 

NOTE:

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

 

 

 

26.1 Applications

 

Figure 26-1 illustrates using function code 26 to acquire an analog value from another node. The Cnet connects the analog

output signal in node one to the analog input in node two.