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| 5/9/2012 1:14 PM | |
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Posts: 1750 Rating:
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Hello, Please check mA signal with multi-meter. I guess mA may be less then 4 when your value is below zero. |
| 5/10/2012 11:59 AM | |
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Posts: 88 Rating:
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Ya!!! the mA value is less than 4mA. But I am not setting alarm in CFC block for lower mA. Is this the default quality bad alarm for low mA signal??????????? |
| 5/10/2012 1:05 PM | |
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Posts: 212 Rating:
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Please find attached extract of S7 300 modules. If Current value and hence the relevent counts are not in the range of 0 to 27648, same shall show QBAD. Check and revert AttachmentS7-300_MODULES.pdf (161 Downloads) |
| 5/11/2012 3:31 PM | |
Joined: 1/15/2009 Last visit: 10/30/2025 Posts: 316 Rating:
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Manoranjan, Which version of PCS7 are you working with and which channel driver are you using? -The channel driver will be posting the bad quality to your Analog Monitoring blocks that pass up to the HMI. --> If using APL your default limits are 3.6mA to 21mA, outside that range and its going to post Bad = 1. You can define other limits by setting the NamurOff bit equal to 1 and then set your new limits on the HighLimit and LowLimit input parameters. --->Ofcourse your new limits must reside inside the overshoot and undershoot range of your module -If you are not using APL and your using the standard CH_AI, the default mA are the same (3.6->21mA), but also can be changed via the CH_F_ON=1 then set new limits for CH_F_HL and LL. you can find the specs of your IO modules here, http://support.automation.siemens.com/US/view/en/8859629 Goodluck! |
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