TIMERS

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TIMERS

• When and how to use them

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In process controls the timing is often really
important a stable time basis is necessary to
sincronyse all the steps of signalling plants
(e.g. traffic light plants)
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Traffic light simulation system
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it is sometimes possible to measure a quantity,
controlling the length of time the action
requires (e.g. the radius lift arm which takes
the inert materials necessary to produce
concrete)
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Radius lift arm
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it is sometimes necessary to verify that a
certain action is over within the given time or
to stop it (time out alarm)
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Automatic gate
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TIMERS are tha macro instructions available in
every PLC (programmable logic controller) in
order to control the processes mentioned before.

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S_VIMP timer typeS set inputTW time
constantR reset inputT no. timer numberQ
output timerDUAL time missing to the end, in
Binary codeDEZ time missing to the end, in BCD
code
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S_EVERZ timer typeS set inputTW time
constantR reset inputT no. timer numberQ
output timerDUAL time missing to the end, in
Binary codeDEZ time missing to the end, in BCD
code
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S_SEVERZ timer typeS set inputTW time
constantR reset inputT no. timer numberQ
output timerDUAL time missing to the end, in
Binary codeDEZ time missing to the end, in BCD
code
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S_AVERZ timer typeS set inputTW time
constantR reset inputT no. timer numberQ
output timerDUAL time missing to the end, in
Binary codeDEZ time missing to the end, in BCD
code
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BIBLIOGRAPHYSiemens Simatic Software Ladder
Logic Programming manual