Problems with Siemens AI card 6ES7331-7KF02
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I recently encountered a problem: one of the slave units connected to the S7-4000 was equipped with an AI card, model 6ES7331-7KF02. Water got into one of the channels of this instrument, which is a four-wire type instrument. As a result of this, all 7 other channels on that card showed full scale readings. Out of curiosity, I connected the signal wires from that instrument to one of the channels on another identical card; in that case, everything worked normally, including the channel with the problem, which now displayed normal readings as well. After replacing the original card, the problem persisted. I’m not sure what could be the cause ? ?
I don’t fully understand. For 6ES7331-7KF02, when set to four-wire configuration, it is necessary to consider whether an external power supply can be used to power the two-wire instrument. This phenomenon should not occur with four-wire meters, as the 7KF02 features isolation between channels in pairs.
That’s the situation now; the card has been replaced, but the problem persists. I don’t know what the reason is
Measure the signal at full scale, or connect a calibrator with an analog signal to check whether the reading is normal. Use Step7 to perform an online diagnosis of the hardware to see if there are any messages. I can’t remember whether the ABCD settings need to be adjusted on the side of 7KF02; please check again.
It definitely isn’t a problem with the card reader; does a four-wire card reader require some settings, either hardware or software settings?
There is nothing to set on the card aside from the range card. Just imagine – one channel affecting the other 7 channels; that’s not realistic either. The card I used for the alternative channel is also a four-wire system
Has the cause of this problem been identified? I’m encountering the same issue as well, when connecting the vibration transmitter.
If it is a F system, consider passivating the card and power it on again. Single-channel passivation can cause positive block passivation. Swap it with a card that is similar in characteristics, and this will help determine whether there is indeed a problem with that card