5031rdtsl

Hello,

I would like to use the 5031RDTSL unit for zone control of a heating system.
I have a MkII B&W screen *with logic*.
do you have any leads as to some typical set ups for the use of this unit.
I've looked at some of the heating control applications and all this makes sense, but am having some trouble getting the zone temp to work correctly with the code?
I can display/monitor the unit fine?

Any help/advice much appreciated, Aaron

This is my (very basic) code;

Code:

SetPoint := GetCBusLevel("LOCAL", "Heating (Legacy)", "Bed 1 Set Point");
RoomTemp := GetCBusLevel("LOCAL", "Temperature Broadcast", "Bed1 Rm Temp");







if (GetCBusState("LOCAL", "Heating (Legacy)", "HEATING SWITCH") = ON) 
then begin
   if (RoomTemp > SetPoint) then
       SetCBusState("LOCAL", "Heating (Legacy)", "BED 1 EXT RAD", OFF);
       SetCBusState("LOCAL", "Heating (Legacy)", "BED 1 INT RAD", OFF);
   if (RoomTemp < SetPoint) then
       SetCBusState("LOCAL", "Heating (Legacy)", "BED 1 EXT RAD", ON);
       SetCBusState("LOCAL", "Heating (Legacy)", "BED 1 INT RAD", ON);
end;
once (GetCBusState("LOCAL", "Heating (Legacy)", "HEATING SWITCH") = OFF) 
then begin
       SetCBusState("LOCAL", "Heating (Legacy)", "BED 1 EXT RAD", OFF);
       SetCBusState("LOCAL", "Heating (Legacy)", "BED 1 INT RAD", OFF);
end

 

Is this a statement or a question? I assume you are saying you can actually see the correct temperature.

There are several problems with the code.

The code:

Code:

   if (RoomTemp > SetPoint) then
       SetCBusState("LOCAL", "Heating (Legacy)", "BED 1 EXT RAD", OFF);
       SetCBusState("LOCAL", "Heating (Legacy)", "BED 1 INT RAD", OFF);

will switch BED 1 EXT RAD off when RoomTem > SetPoint (which I assume is what you want), but it also switches off BED 1 INT RAD every time the logic runs (which is probably not what you want).

I think that what you intended was:

Code:

if (RoomTemp > SetPoint) then
begin
    SetCBusState("LOCAL", "Heating (Legacy)", "BED 1 EXT RAD", OFF);
    SetCBusState("LOCAL", "Heating (Legacy)", "BED 1 INT RAD", OFF);
end;

The second problem is that the heaters are being switched every scan (5 times per second) which will flood C-Bus with messages and cause the logic engine to raise an error. There are several ways of addressing this, including using "once" statements. Here is one way to fix this:

Code:

once (GetCBusState("LOCAL", "Heating (Legacy)", "HEATING SWITCH") = ON) and (RoomTemp > SetPoint) then 
begin
   SetCBusState("LOCAL", "Heating (Legacy)", "BED 1 EXT RAD", OFF);
   SetCBusState("LOCAL", "Heating (Legacy)", "BED 1 INT RAD", OFF);
end;
once (GetCBusState("LOCAL", "Heating (Legacy)", "HEATING SWITCH") = ON) and (RoomTemp < SetPoint) then 
begin
   SetCBusState("LOCAL", "Heating (Legacy)", "BED 1 EXT RAD", ON);
   SetCBusState("LOCAL", "Heating (Legacy)", "BED 1 INT RAD", ON);
end;
once (GetCBusState("LOCAL", "Heating (Legacy)", "HEATING SWITCH") = OFF) then 
begin
   SetCBusState("LOCAL", "Heating (Legacy)", "BED 1 EXT RAD", OFF);
   SetCBusState("LOCAL", "Heating (Legacy)", "BED 1 INT RAD", OFF);
end

The third problem is that there is no "hysteresis" included. This means that when the temperature gets close to the set point, the heaters will switch off and on a lot. To add +/- 0.5 degree of hysteresis:

Code:

once (GetCBusState("LOCAL", "Heating (Legacy)", "HEATING SWITCH") = ON) and (RoomTemp > SetPoint + 0.5) then 
begin
   SetCBusState("LOCAL", "Heating (Legacy)", "BED 1 EXT RAD", OFF);
   SetCBusState("LOCAL", "Heating (Legacy)", "BED 1 INT RAD", OFF);
end;
once (GetCBusState("LOCAL", "Heating (Legacy)", "HEATING SWITCH") = ON) and (RoomTemp < SetPoint - 0.5) then 
begin
   SetCBusState("LOCAL", "Heating (Legacy)", "BED 1 EXT RAD", ON);
   SetCBusState("LOCAL", "Heating (Legacy)", "BED 1 INT RAD", ON);
end;
once (GetCBusState("LOCAL", "Heating (Legacy)", "HEATING SWITCH") = OFF) then 
begin
   SetCBusState("LOCAL", "Heating (Legacy)", "BED 1 EXT RAD", OFF);
   SetCBusState("LOCAL", "Heating (Legacy)", "BED 1 INT RAD", OFF);
end

The final thing you could do to improve the code is to combine the two places where the heating gets switched off:

Code:

once (GetCBusState("LOCAL", "Heating (Legacy)", "HEATING SWITCH") = OFF) or
     (GetCBusState("LOCAL", "Heating (Legacy)", "HEATING SWITCH") = ON) and (RoomTemp > SetPoint + 0.5) then 
begin
   SetCBusState("LOCAL", "Heating (Legacy)", "BED 1 EXT RAD", OFF);
   SetCBusState("LOCAL", "Heating (Legacy)", "BED 1 INT RAD", OFF);
end;
once (GetCBusState("LOCAL", "Heating (Legacy)", "HEATING SWITCH") = ON) and (RoomTemp < SetPoint - 0.5) then 
begin
   SetCBusState("LOCAL", "Heating (Legacy)", "BED 1 EXT RAD", ON);
   SetCBusState("LOCAL", "Heating (Legacy)", "BED 1 INT RAD", ON);
end;

See the logic example project called "temp control" for a complete solution.

 

Thanks



Thanks very very very much

The only other problem I was having is that when running my original code, assuming the room temp (from the 5031RDTSL) is displaying approx 20 deg C (as a monitor in the B&W screen) then I have to lower the set-point temp to 16 deg C (and the code switched around this point)

I've obviously done something wrong.
Could it be something to do with the variables declared etc???

Code:

{Enter Variable definitions here}
SetPoint, FloorTemp, RoomTemp : real;

I is very knew to this code stuff (as I'm sure you can tell!)

 

You are welcome.

I would suggest ignoring any odd symptoms from the original code and test with the new code. If the problem still exists, then we can look into it further then.

 

Hello again,

finally picking this up . . . .

I've used your code and I have two problems;


The 'BOILER START' output only seems to switch when the
'BED 1 HEATING SWITCH' is switched and not by the RoomTemp/SetPoint?

Also, when adjusting the SetPoint up/down to make the desired output switch about the current RoomTemp it always seems to switch approx 6 deg C from where I would expect(about the SetPoint), even when I heated up the room sensor (5031rdtsl)

where have I gone wrong?


These are my global variables;

Code:

{Enter Variable definitions here}
SetPoint, FloorTemp, RoomTemp : real;

Code:

SetPoint := GetCBusLevel("LOCAL", "Heating (Legacy)", "Bed 1 Set Point");
RoomTemp := GetCBusLevel("LOCAL", "Temperature Broadcast", "Bed1 Rm Temp");



once (GetCBusState("LOCAL", "Heating (Legacy)", "BED 1 HEATING SWITCH") = OFF) or
     (GetCBusState("LOCAL", "Heating (Legacy)", "BED 1 HEATING SWITCH") = ON) and (RoomTemp > SetPoint + 1.0) then 
begin
   SetCBusState("LOCAL", "Heating (Legacy)", "BED 1 EXT RAD", OFF);
   SetCBusState("LOCAL", "Heating (Legacy)", "BED 1 INT RAD", OFF);
   SetCBusState("LOCAL", "Heating (Legacy)", "BOILER START", OFF);
end;
once (GetCBusState("LOCAL", "Heating (Legacy)", "BED 1 HEATING SWITCH") = ON) and (RoomTemp < SetPoint - 1.0) then 
begin
   SetCBusState("LOCAL", "Heating (Legacy)", "BED 1 EXT RAD", ON);
   SetCBusState("LOCAL", "Heating (Legacy)", "BED 1 INT RAD", ON);
   SetCBusState("LOCAL", "Heating (Legacy)", "BOILER START", ON);
end;

 

Any help much appreciated?

 

By the look of it you need an extra set of brackets in your first condition statement.

Code:

SetPoint := GetCBusLevel("LOCAL", "Heating (Legacy)", "Bed 1 Set Point");
RoomTemp := GetCBusLevel("LOCAL", "Temperature Broadcast", "Bed1 Rm Temp");



once (GetCBusState("LOCAL", "Heating (Legacy)", "BED 1 HEATING SWITCH") = OFF) or
     ((GetCBusState("LOCAL", "Heating (Legacy)", "BED 1 HEATING SWITCH") = ON) and (RoomTemp > SetPoint + 1.0)) then 
begin
   SetCBusState("LOCAL", "Heating (Legacy)", "BED 1 EXT RAD", OFF);
   SetCBusState("LOCAL", "Heating (Legacy)", "BED 1 INT RAD", OFF);
   SetCBusState("LOCAL", "Heating (Legacy)", "BOILER START", OFF);
end;
once (GetCBusState("LOCAL", "Heating (Legacy)", "BED 1 HEATING SWITCH") = ON) and (RoomTemp < SetPoint - 1.0) then 
begin
   SetCBusState("LOCAL", "Heating (Legacy)", "BED 1 EXT RAD", ON);
   SetCBusState("LOCAL", "Heating (Legacy)", "BED 1 INT RAD", ON);
   SetCBusState("LOCAL", "Heating (Legacy)", "BOILER START", ON);
end;

If you still have issues regarding the temperature switching after this, it may depend upon how you've got the temperature sensor programmed. It looks like you've got it programmed in '6031TS' mode. If you look on the Global tab you can change the message broadcast rate and a value of change that will trigger an immediate temperature broadcast.

Mounting sensors high or low in a room can have a big impact too, which can be compensated for to some extent with the Temperature Offset feature.

 

Hi All,

I,m still having problems with this??

I've set the sensor up as a 6031.

If I heat the sensor up, the switching point always seems to be approx 4-5 deg C below sensor value (I'm expecting it to operate within dead band range?).

I've tried correcting with offset feature but this just artificially elevates the room temp, but still the 4-5 deg difference.

All the temperatures seem to display correctly?

Also, for some reason the BOILER START command is only operating with the HEATING SWITCH??

I have multiple rooms where once I get the code working, I need to cut and paste etc... What is the best way to switch the one BOILER START when multiple rooms may be trying to enable/disable it?

Aaron

 

Anyone able to help??

Do you need more info from me?

 

Where do you define the level of the "Bed 1 Set Point" group address? The level of this group is not being set by either the unit or logic so you must be setting this somewhere.

Any differences in the maths between how you're mapping the group address level to a temperature value, compared with how the temperature sensor does it, will cause problems. Have you actually worked out what group address levels correspond with what temperatures for the temperature sensor? Do the values coming from the temperature sensor match what you're expecting to get? When the temperature is 20 degrees, what is the level of the "Bed1 Rm Temp", as set by the temperature sensor?

There should be no need to use the offset feature in the temperature sensor unless the temperature you actually measure in the room (with a thermometer or similar) is different to what the temperature sensor is telling you in Toolkit.

You're going to need to set yourself up with the C-Bus Diagnostic utility so that you can actually see what commands are going around on the C-Bus network to debug your setup further.

 

Thanks for the leads - I've looked again at the example temperature project.

I'm probably using the wrong words but this is what I think I've done wrong?!
I created a level component as a single group called 'Bed 1 Set Point'.
Then under visual properties tab I chose c-bus group address custom (0-50)

What I think I need to do is change it to 'real' 'system IO'.

I'll let you know how I get on

Thanks again, Aaron

 

Hello All,

I've finally got this working to a fasion, but have some q's??

I've set the digital room sensors (5031RDTSL) up in sensor mode 6031TS on the Temperature Broadcast application.
I can monitor the room temperatures as level components within PICED.
Within the visual properties tag I have to carry out a 'group address custom and scale to 0-50.
Ive also set up the 'set point' as a level component within the same Temperature Broadcast application.
Now the maths works as expected, ie it switches around set point +/- hysterisis.
But the room temperature seems low (approx 5 deg???)
I've corrected this with the 'offset' feature within toolkit for that sensor.

Why??
Where did I go wrong??

 

Hi Nick,

initially I had used the inbuilt system IO but in 6031TS mode, the logic didnt seem to work as expected. ie it would switch but not around the set point. seemed to display correctly, but in logic seemed to switch 5 deg low??
see earlier posts.

what application should my set point be in??

slightly off topic - is there a way to change all components in the same group on a page to a different application?

Aaron

 

Hi Nick,

Thanks again - I'll give this a go and let you know.

Aaron

 

hello again,

Ive loaded this into piced and toolkit (but not tested it for real yet)
I know its picky, but there dont seem to be any units for the temp
Did I miss something?

Aaron

 

hello again,

Ive loaded this into piced and toolkit (but not tested it for real yet)
I know its picky, but there dont seem to be any units for the temp
Did I miss something?

Also, in my logic/code how do i refer to the new measurement?

TIA

Aaron

 

Hello again,

I searched for the following in the logic help file
"Use the GetIBSystemIO function - check out the help for details."

found

GetIntIBSystemIO

would I use something like

GetIntIBSystemIO("Measurement App Real Value", 254, 103, 1)

Also, in PICED when I select

'system I/O Custom' in 'value' sub tab of the 'visual properties' tab
so that I can post fix text a 'C'
the text position seems to default to a fixed size??
which is too big??

Aaron