Temperature Sensor with CtrlX and S20-AI-4-RTD

[E_Stapel]

Hello everyone,

i have a PT 1000 temperature sensor that is connected with a S20-AI-4-RTD I/O and the CtrlX. The PT 1000 has a 2-wire-connection and is wired as you can see in the first picture.
At least I want to see the real time data with the unit °C. Right now there is just the same constant value (32772) at every Temperature_Input_Channels.RTD_Channel at the Data Layer even though there is only one channel wired. (picture 2)
How can I get those real time temperature data?

[CodeShepherd · Accepted solution]

The S20-AI-RTD is set by default to 3-wire connection for a PT100 and needs to be configured accordingly if needed different. See documentation on our homepage. See chapter "20 Application objects". Or a detailed explanation below.

Add the corresponding setting to the EtherCat startup parameter. See this topic for how to do so.

[E_Stapel]

@CodeShepherdthank you for your quick answer.

In your example you set the command value to (00,00,128,00,00,01,00,01,00,01,00,01). I don´t understand exactly how you get that 128.

As you can see in the picture I did my parameterization along the documentation for the S20-AI-4-RTD. With the PT 1000 2-wire temperature sensor my result is (01,00,11,00,00,00,00,00). I also tried (00,00,128,01,00,01,00,11,00,00,00,00,00) and some other variants but with no success.

I didn´t understand how to connect the documentation "Writing to PDI objects with PDI Write Tunnel” with the documentaion "S20-AI-4-RTD - Application objects"

Can you help me out please?

[CodeShepherd · Accepted solution]

I also like to mention our how to area. For your case "How to configure adjustable S20 IO peripherie connected by S20-EC-BK using PDI-Write service".

The values represent a byte array (higher byte, lower byte). In standard they are written as decimal numbers so address 0080 hex = 128 decimal.

Setting for your channel:

Bit	15	14	13	12	11	10	9	8		7	6	5	4	3	2	1	0
Type	Con-	ductor	Fil-	ter	R0	R0	R0	R0		Reso-	lution	0	0	Sen-	sor-	ty-	pe
Result	0	1	0	0	1	1	0	0		0	0	0	0	0	0	0	0
Hex	4C									0
Dec	76									0

Data for PDI write channel, assuming correct submodul is written(See S20-EC-BK documentation, Chapter "Writing to PDI objects with “PDI Write Tunnel”"):

(00,00,128,00,00,76,00,00,00,00,00,00,00):

Byte 0	Subslot	00	0
Bytes 1, 2	PDI object index	0080h	0, 128b
Byte 3	PDI object subindex	00	0
Byte 4	Length of the data to be written	00	0
Bytes 5, 6	Parametrization Channel 1	4C00h	76b, 0
Bytes 7, 8	Parametrization Channel 2	0000h	0, 0
Bytes 9, 10	Parametrization Channel 3	0000h	0, 0
Bytes 11, 12	Parametrization Channel 4	0000h	0, 0

[E_Stapel]

Hello @CodeShepherd,

your answer was really helpful and the parametrization is clear to me. Unfortunately the Data Layer shows still the wrong value. The PT 1000 is wired in channel 1 and on the Data Layer is on every Channel a very high value (see picture).

Channel 1: 32769

Channel 2-4: 32770

At least I want to see the right value in °C as I configured the parametrization.

[CodeShepherd]

I made a mistake in the post above and corrected it now. Please always also refer to the manuals.

[cc2go]

can you please go online to the bus coupler and to the PDI read tunnel of the module and read the config 0x80 online and provide it here?

In my example a module is connected to slot 1 (0x3000) if your module is on another slot x than its 0x300x

[E_Stapel]

thank you @CodeShepherd. Now the value fluctuates between 312 and 315.  I assume that this values show 31,2°C - 31,5°C.

@cc2goas you can see in my example the module is connected to slot 4 (0x2003).