FC 25 - Analog Input (Periodic Sample)

In the BRC-100 controller the analog input function code acquires an analog input signal from another module in the same PCU node via the Controlway/module bus. This analog input signal is updated at periodic intervals. The update time is specified by the periodic I/O sampling period (S13) of the segment control block located in the module containing function code 25.

 

The HAC controller uses FC25 to acquire an analog input signal from another HAC controller via the peer-to-peer network. Specification S8 in FC 57 node statistics block is used to specify the maximum number of destination nodes the HAC controller may communicate with. This analog input signal is updated at periodic intervals. The update time is specified by the periodic I/O sampling period (S13) of the segment control block located in the module containing function code 25.

 

To insure that the signal is successfully acquired from the source node/module, the analog signal generates a point quality flag. To test the quality of the signal, include a function code 31 (test quality) block in the configuration. The output of the test quality block can be used as an input to other digital processing blocks.  Refer to Appendix H, for a definition of point quality.

 

NOTE: A block defined as an analog input reads a value for any existing analog output from a function block configured in the source node/module. No additional configuration in the source node/module is required.

 

Outputs:

Blk

Type

Description

N

R

Output value and quality. Quality:

0 = good

1 = bad

 

 

Specifications:

Spec

Tune

Default

Type

Range

Description

S1

N

0

I

Note 1

Requested module address

S2

N

0

I

Note 2

Requested block address

 

NOTES:

1. Range values are:0-31 for the BRC-100, IMMFP11/12 and 1-250 for the HAC

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

 

 

25.1  Applications

 

Figure 25-1 and 25-2 shows how to use function code 25 to transport an analog value from one module to another module

via the Controlway or module bus. The function code 31 (test quality) block optionally monitors point quality.