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Forum index » Science and Technology » Engineering » Control
STEP7 -> VAT hanging problem
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kyoq
science forum beginner


Joined: 16 Mar 2006
Posts: 6

PostPosted: Fri Mar 17, 2006 1:11 pm    Post subject: STEP7 -> VAT hanging problem Reply with quote

Hi, has anybody faced the observation variables problem under VAT ? I
have 2 PLC's connected over Ethernet, first PLC I can observe without
hanging, second not ...after every hang I have to enforce observation
mode pressing again out and in Monitor variable icon (eyeglases icon)

Cheers
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Balki
science forum beginner


Joined: 28 Jan 2006
Posts: 8

PostPosted: Fri Mar 24, 2006 3:59 am    Post subject: Re: STEP7 -> VAT hanging problem Reply with quote

The following you may check.
1. PLC memory full / nearly full
2. Your size of VAT is big (more than 10variables)
3. Hubspeed is slow
4. Your program and hence sacan cycle is too high
5. Others are connected (i.e the port serves also other devices)
6. You have the program debug ON

The solution can be to increase the communication time alloted in the
whole scan cycle.
Regards
Balki
You may also post the way you solved the problem
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kyoq
science forum beginner


Joined: 16 Mar 2006
Posts: 6

PostPosted: Mon Apr 10, 2006 7:56 am    Post subject: Re: STEP7 -> VAT hanging problem Reply with quote

Balki napisał(a):
Quote:
The following you may check.
1. PLC memory full / nearly full
2. Your size of VAT is big (more than 10variables)
3. Hubspeed is slow
4. Your program and hence sacan cycle is too high
5. Others are connected (i.e the port serves also other devices)
6. You have the program debug ON

The solution can be to increase the communication time alloted in the
whole scan cycle.
Regards
Balki
You may also post the way you solved the problem



I checked everything and still i have the problem,
furthermore with simplest program i.e. INC value and observing it
makes problem :// additionally the same program on the another PLC works.
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Balki
science forum beginner


Joined: 28 Jan 2006
Posts: 8

PostPosted: Tue Apr 11, 2006 8:13 am    Post subject: Re: STEP7 -> VAT hanging problem Reply with quote

further you may check this?
1. distance between PG and PLCs
2. Cabling and the Hub port
3. Whether the PLC port works well for other facilities provided for
the port?.
4. Interchange if it is CP for both PLCs and confirm which is faulty?
nothing more from my side
Balki
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Balki
science forum beginner


Joined: 28 Jan 2006
Posts: 8

PostPosted: Tue Apr 11, 2006 9:49 am    Post subject: Re: STEP7 -> VAT hanging problem Reply with quote

distance of both PLCs while checking and via MPI or DP or Ethernet?
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Balki
science forum beginner


Joined: 28 Jan 2006
Posts: 8

PostPosted: Tue Apr 11, 2006 9:56 am    Post subject: Re: STEP7 -> VAT hanging problem Reply with quote

distance of both PLCs while checking and via MPI or DP or Ethernet?
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raczu
science forum beginner


Joined: 30 May 2006
Posts: 1

PostPosted: Tue May 30, 2006 2:47 pm    Post subject: Re: STEP7 -> VAT hanging problem Reply with quote

Balki napisał(a):
Quote:
distance of both PLCs while checking and via MPI or DP or Ethernet?


Finally It was processor defect of second PLC.
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