Pixsys PL260, User Manual

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2.2.3 Bistable relays B
64 bistable relays are available on PL260. Each consists of one coil and
the relevant logic contact N.O. and N.C. .
Energizing coil “B”, the relevant logic contact will change its state (it opens
if previously closed, it closes if previously open). The N.O. contact is closed
(on) when bit value is 1. The N.C. contact is open (on) when bit value is 0.
At starting of PLC the N.O. contact is open.
2.2.4 Timer T
Three different operating modes are available for Timers:
•
TON. Mode Start timing as delay at activation counts time when coil
is active (ON). Timing bit (contact T) is activated when actual value (T)
is equal or higher than preset time (PT). When coil is deactivated
(OFF), actual value of timer is reset. Timer keeps on counting after
reaching preset value and it stops reaching the max. value 32767.
•
TOFF. Mode Start timing as delay at deactivation allows to delay the
deactivation of an output for a certain time after the input has been
deactivated. When the coil is activated, the timing bit (contact T) is
immediately activated and the actual value (T) is set to zero. At
deactivation of coil, the timer counts until elapsed time is equals to
preset timer (PT). After reaching the preset timer, timing bit is
deactivated and actual value does not increase. If input is deactivated
for a time which is lower than preset time, the timing bit is still active.
To start counting, the function TOF must notice a transition from
activated to deactivated (ON
OFF).
•
TONR. Mode Start timing as delay at activation with memory counts
time when coil is activated (ON). Timing bit (contact T) is activated
when actual value (T) is bigger or equals to preset time (PT). When
coil is deactivated (OFF), actual value of timer “delay at insertion with
memory” is stored. This value allows to accumulate time for more
activation peroids of the coil. Actual value of timer can be reset with
operation MOV(Tx = #0). Timer keeps on counting after reaching
preset value and it stops reaching the max. value 32767.
Timers with operating modes TON, TONR and TOF are available in three
different resolutions, not depending from number of timer; they can be