Fail safe Namur Digital input and not fail s7-300

Hi guys, I am trying to connect relay digital output as input to the namur failsafe digital input. I am doing  this all on the same CPU because I don't have other plc to use it separetely. So the situation is like this, in the hardware I have CPU 300, RELAY DO and Fail safe NAMUR DI. Fail safe NAMUR DI is configured to operate in standard mode, so it should be like normal Namur DI?

So I am trying to use RELAY DO as input to Namur DI,l. When the Relay output is true, on the Namur input I measured 24V but the led is not on and in variable table I see the input is false. And when the Relay output is low, I measured 8.2V on the Namur DI.

The fail safe Namur diagnostic interrupt is turned off and the channel diagnostic is turned off. 

Addresses of the Namur DI are START:8 and END:13. For reading digital inputs in VAT table I am using addresses I 8.0-I 8.7, because it has 8 inputs(6ES7 326-13RF01-0AB0).

How can I use FDI Namur to read a value from realy output?

EDIT:

In module parameters I have turned on group diagnostic for channel 0 and channel 3. But now Namur module is in SF, and in diagnostic buffer of the Namur modul i have:

"Module not assigned parameters"

"Wire break or internal error in sensor supply"

dolbyinside

Hi guys, I am trying to connect relay digital output as input to the namur failsafe digital input. I am doing  this all on the same CPU because I don't have other plc to use it separetely. So the situation is like this, in the hardware I have CPU 300, RELAY DO and Fail safe NAMUR DI. Fail safe NAMUR DI is configured to operate in standard mode, so it should be like normal Namur DI?

So I am trying to use RELAY DO as input to Namur DI,l. When the Relay output is true, on the Namur input I measured 24V but the led is not on and in variable table I see the input is false. And when the Relay output is low, I measured 8.2V on the Namur DI.

The fail safe Namur diagnostic interrupt is turned off and the channel diagnostic is turned off. 

Addresses of the Namur DI are START:8 and END:13. For reading digital inputs in VAT table I am using addresses I 8.0-I 8.7, because it has 8 inputs(6ES7 326-13RF01-0AB0).

How can I use FDI Namur to read a value from realy output?

 Hello dolbyinside,

I think you mean 6ES7 326-1RF01-0AB0 module:

First you shall do the connection as in the attached picture

This picture is as per manual "s7300_failsafe_signal_modules_hardware_manual_en-US_en-US" page 113

Thanks for the reply, yes my bad I meant 6ES7 326-1RF01-0AB0.

According to the picture, resistors need to be installed on the contacts of the namur inputs?

I belived that they are already inside of the module, thanks for clearing that out, I will try that;)

dolbyinside

 And when the Relay output is low, I measured 8.2V on the Namur DI.

 The source of the 8.2V is the NAMUR Channel as you can find in this Datasheet

dolbyinside

According to the picture, resistors need to be installed on the contacts of the namur inputs?

 No the resistances need to be connected to a free contact of the RELAY DO module (which you are using instead of the NAMUR sensor)

Hello,

dolbyinside

I belived that they are already inside of the module

No this is a type connection used to connect free contacts to NAMUR input modules to be able to detect both wire break and short circuit

Thanks for the response. I will connect resistors on the relay outputs.So that is the way of connecting monitored contactals to the namur digital input. Thanks a lot for clearing that out. 

Sorry for bothering you this much, but in the relay output (322-1HH01-0AA0) I have 24V connected on pin 1(common). Pins 2-9 are relay outputs and the will be connected to the namur input. Namur input has 2 pins per channel. 

I need to connect relay output pin 2 to the pin 5 and pin 6 to the minus (pins 5 and 6 on the namur input). And add 10k between pin 1(common) and pin 2 on the relay output, but where to add 1k?

dolbyinside

I have 24V connected on pin 1(common).

 You shall not supply 24V to this circuit at all, The NAMUR input channel supplies the voltage of this circuit

dolbyinside

I need to connect relay output pin 2 to the pin 5 and pin 6 to the minus (pins 5 and 6 on the namur input). And add 10k between pin 1(common) and pin 2 on the relay output, but where to add 1k?

Pin 5 of namur input to pin1 of relay output? 

Would I be able to use all other relay outputs as inputs on the rest namur inputs? Sorry for stupid questions..

dolbyinside

Pin 5 of namur input to pin1 of relay output? 

Would I be able to use all other relay outputs as inputs on the rest namur inputs? Sorry for stupid questions..

 Hello,

This question is actually very important

This connection is for free contacts not for common terminal contacts (as in your case)

I thought you need to test the connection using one channel from DO module

The question is why do you need to connect DO module to DI NAMUR module?