problems with PT100 display

[El Buga]

Hi, i have a PT100 and it was working normally,  but yesterday i turned off the PLC and when i  turned on agan the display in the HMI (variable,numeric) did not showed me numers, just  "**.*",  i thought the wires were disconected or something but no, i tried with another plc  (are the same, SM35-J-RA22) and it works, with the same PT100 and program, i don't know what i have to do, sorry for my english xD

[Joe Tauser]

The asterisks mean the data value is larger than the digits configured on the HMI.  If you go online with the PLC, what is the value in the MI register assigned to that input?

Joe T.

[El Buga]

9 hours ago, Joe Tauser said:

The asterisks mean the data value is larger than the digits configured on the HMI.  If you go online with the PLC, what is the value in the MI register assigned to that input?

Joe T.

The value is 32767, but doesn't have sense because the other PT100 port have the same value (not used), l think plc is not reading  PT100 ohms,  but again, with other PLC, the same program and PT100 it does

[Flex727]

The value 32767 is an error value to tell you that the input is greatly out of range.

[El Buga]

16 minutes ago, Flex727 said:

The value 32767 is an error value to tell you that the input is greatly out of range.

i measured the PT100 (connected in the plc) and marks 110 ohms, it can be a continuity problem in the connections ports?

[Joe Tauser]

32767 is an open circuit.  You have a wiring problem, the jumpers are set wrong, or the PLC is bad.

In that order.

Joe T.

[El Buga]

2 hours ago, Joe Tauser said:

32767 is an open circuit.  You have a wiring problem, the jumpers are set wrong, or the PLC is bad.

In that order.

Joe T.

the wires and jumpers are well connected, what could be wrong with the PLC?

[kratmel]

If you have two similar PLC - then you can replace IO board for test what is wrong - PLC program or PLC IO hardware.

By the way - you have two PT 100 input on SM35-J-RA22- do you test the same PT100 on another one?

 

P.S. Maybe replace green connector is the solution?

 

[AlexUT]

Hi,

1. Please check jumpers for good contact. *Take jumpers from other PLC for test.

2. It is not recommended to exchange board.

Upside board store all calibration data for upside board.

Downside board store all calibration data for upside board.

B.R.

 

 

[El Buga]

43 minutes ago, kratmel said:

If you have two similar PLC - then you can replace IO board for test what is wrong - PLC program or PLC IO hardware.

By the way - you have two PT 100 input on SM35-J-RA22- do you test the same PT100 on another one?

 

P.S. Maybe replace green connector is the solution?

 

i replaced the IO board and doesn't work, i have 4 PT100 and doesn't work with any , i just hace one connected with the PLC but i changed the PT100 input and was the same prpblem  :c

[kratmel]

On another SAMBA you can use the same program with the same sensors without problem?

Then maybe something wrong with PLC...

I recommend: replace battery, init & reset PLC, download blank project, download your project --- Result?

Last chance - replace firmware via visilogic...

 

P.S. You change green connector to another one for test?

 

P.P.S

9 hours ago, AlexUT said:

2. It is not recommended to exchange board.

It is only temporary for find what is wrong.

[AlexUT]

Please show how you set all Input jumpers and how you wired PT100 sensor.

Hope it is 3 wires.

Use minimum configuration for test - only 2 AI.

B.R.

 

[El Buga]

39 minutes ago, AlexUT said:

Please show how you set all Input jumpers and how you wired PT100 sensor.

Hope it is 3 wires.

Use minimum configuration for test - only 2 AI.

B.R.

 

yes is a 3 wires PT100, two of them to 7 and 8 inputs and common to 4

[El Buga]

6 hours ago, kratmel said:

On another SAMBA you can use the same program with the same sensors without problem?

Then maybe something wrong with PLC...

I recommend: replace battery, init & reset PLC, download blank project, download your project --- Result?

Last chance - replace firmware via visilogic...

 

P.S. You change green connector to another one for test?

 

P.P.S

It is only temporary for find what is wrong.

how can i reset the PLC? i found switch to factory boot in visilogic but the PLC screen just turned red

[El Buga]

6 hours ago, kratmel said:

On another SAMBA you can use the same program with the same sensors without problem?

Then maybe something wrong with PLC...

I recommend: replace battery, init & reset PLC, download blank project, download your project --- Result?

Last chance - replace firmware via visilogic...

 

P.S. You change green connector to another one for test?

 

P.P.S

It is only temporary for find what is wrong.

and yes, i replaced the green connector

[Flex727]

1 hour ago, El Buga said:

how can i reset the PLC?

In VisiLogic, go to Connection / Communication & OS / click the second tab / click the button for Initialize & Reset.

[El Buga]

On 9/26/2020 at 10:25 AM, Flex727 said:

In VisiLogic, go to Connection / Communication & OS / click the second tab / click the button for Initialize & Reset.

didn't  work, actually i changed de input to ohms and nothing, same error

[Ausman]

Please get a 250 Ω pot and place that in your circuit instead of the PT100, and see what happens with varying  it.