Why does my keypresse "fast sending mode" of a PCD7.D16x or PCD7.D17x send characters faster?

FAQ #101608

 

Symptom
The latest hardware of the PCD7.D16x and PCD7.D17x (introduced into production beginning of 2010) uses a new chip and firmware 002 which is faster than the previous one. This concerns the key pressed "fast sending mode": with firmware 002 the characters are sent faster than with FW 001.
Note that this only concernes programs written in IL which are not prepared to receive the characters quickly (or more than one per cycle) With the HMI Editor no problem will arise (because the HMI Editor copes with the faster reception of the characters).

Reason
With the new chip, the auto-repeat of the keys is aroound 5 times faster with firmware 002 than in former PCD7.D16x and PCD7.D17x with Firmware 001.
This may results into wrong behaviour of the key functionality if the display is programmed in IL, and the buffer is not read sufficiently fast.
 
Solution
There's a new firmware 021 which will be introduced in the first half year of 2011 into production.
In case you need an updated display earlyer than this, please contact your local sales office.