Scan Time of S5

Hi all,
How can I monitor the cycle scan time in a S5 135/928 Siemens PLC. It has something to do with OB152 but I am unsure how to program it to read the statistical values.
Anyone have any experience with this ?
(this is so easy in AB ! )

Thanks

this is so easy in AB

Click to expand...

I know! But if you know how it's also easy in S5, believe me. Now, let's get to business. Right now I'm not at the office for the rest of the week, but if no one comes up with an answer for you, I'll try to give it by monday. It might even be somewhat sooner, if I can find it at home tonight.

So please have some patience.

Kind regards,

thanks...waiting is not a problem

OK, I'm back in the office, the necessary paperwork has been done and I'm free again to tackle the everyday technical stuff, which I like much better than paperwork .

The problem with OB152 exists only because Siemens wants to do all cycletime statistics with only one function. The first thing to do is tell OB152 which function you want to perform. To do this, just load the function number in accumulator 1 prior to calling OB152. The functions available are:

• Function 0: switch off statistics
• Function 1: read actual and last cycletime (actual cycletime gives an incorrect reading)
• Function 2: reads minimum and maximum cycletime
• Function 3: read average cycletime and cyclecounter
• Function 8: initialise the cycletime statistics
• Function 15: switch on statistics

You can start the statistics for instance in the initialisation OB's like this:

L   KF +15

JU  OB 152

Reading the statistical information has to be performed from an FB, because the instruction to exchange accumulators 1 and 2 (TAK) can only be performed in an FB. To extract the actual and the last cycle time use the next sequence:

L   KF +1

JU  OB 152

T   FW 100

TAK

T   FW 102

It seems something went wrong, because I was interrupted by a colleague and in this way it took me too long to respond, so I became a guest with an incomplete post. I'm retaking it from the top:


OK, I'm back in the office, the necessary paperwork has been done and I'm free again to tackle the everyday technical stuff, which I like much better than paperwork .

The problem with OB152 exists only because Siemens wants to do all cycletime statistics with only one function. The first thing to do is tell OB152 which function you want to perform. To do this, just load the function number in accumulator 1 prior to calling OB152. The functions available are:

• Function 0: switch off statistics
• Function 1: read actual and last cycletime (actual cycletime gives an incorrect reading)
• Function 2: reads minimum and maximum cycletime
• Function 3: read average cycletime and cyclecounter
• Function 8: initialise the cycletime statistics
• Function 15: switch on statistics

You can start the statistics for instance in the initialisation OB's like this:

L   KF +15       Start statistics

JU  OB 152

Reading the statistical information has to be performed from an FB, because the instruction to exchange accumulators 1 and 2 (TAK) can only be performed in an FB. To extract the actual cycle time (from accu 1) and the last cycle time (from accu 2) use the next sequence:

L   KF +1        Read actual + last cycle time

JU  OB 152

T   FW 100       Save actual cycletime in FW 100

TAK              Exchange accu's 1 and 2

T   FW 102       Save last cycletime in FW 102

I hope this info helps.

Kind regards,

Jean Pierre

This is the sort of info I like to keep

I have had no call to do this yet, but you never know!!!!

Thanks for posting this.

Paul

Thanks very much Jean Pierre.
I will be trying this later in the week when time permits....will post how it goes.
Again thanks
Steve