No EDOC available right now but there is a manual that describes the PLB
functions including timers. You can only see the timer values from a PLB
Monitor app/environment and you will have to program the timer to cycle an OFL
from the PLB block so you can connect it to other blocks if the COUT isn't
contained in the ladder FBM.
An alternative would be to use a CALC block which has delay on and delay off
functions named DON and DOF if memory serves me Dirk. CALC blocks also have one
shot pulse (OSP ) that is invoked as OSP 3 for a 3 second pulse.
Your CALC code could look something like this I think.
STEP01 IN BI01; (your Boolean sustained trigger)
STEP02 BIF 09; (go to STEP09 if false)
STEP03 OUT BO01; (if true set BO01 true)
STEP03 DOF 1; (if true delay off in 1 second)
STEP04 OUT BO01; (once false set BO01 false)
STEP05 IN BI01; (bring in 1 from Boolean trigger)
STEP06 DON 1; (wait 1 sec before setting true)
STEP07 OUT BO01; (set BO01 true)
STEP08 BIT 11; (go to STEP 11 to keep BO01 true til next cycle)
STEP09 IN BI01; (if you are here BI01 trigger is false so....)
STEP10 OUT BO01; (set BO01 false whenever BI01 is false)
STEP11 END; (exit and do it all again next cycle)
Not sure if my steps are exactly right but it should be close. Connect your
Boolean trigger to CALC BLK.BI01 and .BO01 to the device you want to turn on
and off.
Tom VandeWater
Control Conversions, Inc.
On Jan 29, 2016, at 12:20 AM, Dirk Pauwels <dirk.pauwels@xxxxxxxxxx> wrote:
Hi list,
Does anyone know where I can find info on the use of timers in the PLB's?
Can't seem to find it in the documentation.
I need to turn a sustained contact into a repated pulsed contact (on - delay
- off - delay - on.......)
Gdev and COUT have pulse option, but it's not settable or connectable, and if
the input (AUTDSR) is true, the pulse is only actuated once, so my other
option is PLB (we have our GDEV's setup for PLB) or logic.
Thanks & Rgds,
Dirk
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