Logix 5000 First Scan Bit - PLCS.net

russrmartin · September 14th, 2004, 01:39 AM

I know that to get the first scan bit out of a CL5000 processor, you need to use a GSV. But that is as far as I get. I cannot find the actual first scan object. Can anyone tell me where to get this, or post a screen shot of a GSV in which they got this bit? Thanks.

Russ

Gerry · September 14th, 2004, 01:59 AM

Use a XIO or XIC instruction with address S:FS

No GSV required.

jvdcande · September 14th, 2004, 03:53 AM

Gerry is right. Browse the on-line help for "Monitoring Status Flags". You'll find several S: flags, such as S:C for carry, S:N for negative result and S:MINOR for detection of minor faults, besides S:FS for first scan.

Kind regards,

akreel · September 14th, 2004, 09:48 AM

Thanks guys! I was wondering about that, too!
Especially since the "power-up" routine is exactly that. Don't expect the power-up tasks to get executed unless you unplug the controller. Switching from Program to Run doesn't do it.

AK

September 14th, 2004, 01:39 AM	#1
russrmartin Member Join Date: Aug 2002 Location: Eastman, Wisconsin Posts: 735	Logix 5000 First Scan Bit I know that to get the first scan bit out of a CL5000 processor, you need to use a GSV. But that is as far as I get. I cannot find the actual first scan object. Can anyone tell me where to get this, or post a screen shot of a GSV in which they got this bit? Thanks. Russ

September 14th, 2004, 03:53 AM	#3
jvdcande Member Join Date: Apr 2002 Location: Menen Posts: 1,948	Gerry is right. Browse the on-line help for "Monitoring Status Flags". You'll find several S: flags, such as S:C for carry, S:N for negative result and S:MINOR for detection of minor faults, besides S:FS for first scan. Kind regards, __________________ Jean Pierre Vandecandelaere Trainer nautical sector VDAB Competentiecentrum L. Blondeellaan 9 B-8380 Zeebrugge Belgium

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September 14th, 2004, 01:59 AM	#2
Gerry Member Join Date: Jun 2002 Location: Auckland Posts: 1,134	Use a XIO or XIC instruction with address S:FS No GSV required.

September 14th, 2004, 09:48 AM	#4
akreel Member Join Date: Apr 2002 Location: Milwaukee, WI Posts: 1,172	Thanks guys! I was wondering about that, too! Especially since the "power-up" routine is exactly that. Don't expect the power-up tasks to get executed unless you unplug the controller. Switching from Program to Run doesn't do it. AK

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