Step7 timers

Gromit · Mar 17, 2009

Hello,

How can we use the timer S_ODT with a variable instead of constant time.
For exmaple not typing "S5TIME#2S" for TV, but using a time, defined in the MW100 memory.
That MW100 memory could be defined by an HMI panel.

Regards

Weo · Mar 17, 2009

Gromit said:
Hello,

How can we use the timer S_ODT with a variable instead of constant time.
For exmaple not typing "S5TIME#2S" for TV, but using a time, defined in the MW100 memory.
That MW100 memory could be defined by an HMI panel.

Regards

You can use a MW, but first read the help file for the "S5TIME" format and make sure you understand it. Time is BCD coded and have a binary coded time base.

OR
Look at this thread and the answer you got there, instead you insert a variable of type "S5TIME", if it´s a siemens HMI you are using you just tag the variable to your panel and you´re done.

http://www.plctalk.net/qanda/showthread.php?t=45817

Gromit · Mar 17, 2009

Thank you!

ivo.maenen · Mar 17, 2009

MW100 = INT from the HMI, say '123'

first: convert INT to BCD, MW100 becomes, e.g. MW102 (123-BCD-coded) and use the ENO from the conversion for setting the timebase.

second: set the timebase with -(S)- instruction: example

S M102.4
S M102.5

this gives you timebase 100 ms meaning the timer will start with 123x100ms.

Use MW102 as TV (timevalue).

jvdcande · Mar 17, 2009

ivo.maenen said:
MW100 = INT from the HMI, say '123'

first: convert INT to BCD, MW100 becomes, e.g. MW102 (123-BCD-coded) and use the ENO from the conversion for setting the timebase.

second: set the timebase with -(S)- instruction: example

S M102.4
S M102.5

this gives you timebase 100 ms meaning the timer will start with 123x100ms.

Use MW102 as TV (timevalue).

Ivo,

with both those bits set, you'll get a timebase of 10s, not 100ms. The right timebases are:

M102.5 = 0; M102.4 = 0 - timebase 10ms
M102.5 = 0; M102.4 = 1 - timebase 100ms
M102.5 = 1; M102.4 = 0 - timebase 1s
M102.5 = 1; M102.4 = 1 - timebase 10s

Kind regards,

ivo.maenen · Mar 18, 2009

jvdcande said:
Ivo,

with both those bits set, you'll get a timebase of 10s, not 100ms. The right timebases are:

M102.5 = 0; M102.4 = 0 - timebase 10ms

M102.5 = 0; M102.4 = 1 - timebase 100ms

M102.5 = 1; M102.4 = 0 - timebase 1s

M102.5 = 1; M102.4 = 1 - timebase 10s

Kind regards,

Thanks Jean-Pierre,

i rechecked my notes for this code with an HMI and I made a mistake, it should indeed have been:

set M102.4
reset M102.5

Jeebs · Mar 18, 2009

jvdcande said:
Ivo,

with both those bits set, you'll get a timebase of 10s, not 100ms. The right timebases are:

M102.5 = 0; M102.4 = 0 - timebase 10ms

M102.5 = 0; M102.4 = 1 - timebase 100ms

M102.5 = 1; M102.4 = 0 - timebase 1s

M102.5 = 1; M102.4 = 1 - timebase 10s

Kind regards,

Sorry, but this just makes me /twitch.
Tell the guy the significance of these bits, where do they come from. Make him understand, not just copy/paste.

Open up your STL/FBD/LAD editor> Help > Help on STL > Index > Search for 'Time base'.
In that document there is also a link to the S5TIME format.

Read them both.

In the OP's application he can just:

Code:

L MW100       [I]// This is your selected time. 0-999 in BCD/hex format. On HMI-Panel make the input field Hex, not decimal.[/I]

L W#16#x000   [I]// x being the time base: 0 for 10ms, 1 for 100ms, 2 for 1s, 3 for 10s[/I]

OW           [I]// This adds your selected time with your timebase, thus creating the same structure as a S5Time[/I]

SD T40       [I]// Preset on delay timer with your selected time[/I]

The same can be achieved with LAD. You'll need an aditional temp word to hold the WOR_W result so you can use it with the S_ODT.

Like such:

Step7 timers

Gromit

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Weo

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Gromit

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ivo.maenen

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jvdcande

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ivo.maenen

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Jeebs

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