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dS2824

dS2824 User Manual v4.12

So now the relay we wish to control is mapped to virtual relay 29 and the input that is going to

control it is mapped to input 161, which is the 2

input on mapping 31. The input number was

obtained from the table on a previous page.

Now we can go to the Relays page and configure the relay. Select relay 29 from the drop-down

box.

If you want, you can give the relay a more descriptive name. To use input 161 as an analogue

input we use A161. If we wanted a digital input it would be D161. Enter the following into the

Pulse/Follow box:

A161<511

All other fields can remain empty.

Now the relay will turn on when the input is less that 511.

Although A161<511 is simple to understand, its not actually the best way to do it. Analogue

inputs by their nature can jitter around. This can cause the relay to pulse on/off as the input

jitters close to 511. A better way is to include some hysteresis like this:

(A161<509&!R29)|(A161<513&R29)

This means the relay will turn on when the input is below 509 (508 or less), but will not turn

off again until the input is above 512 (513 or more). The greater the difference between the

two numbers, the greater the hysteresis.

Devantech dS2824 User Manual

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