Step7. Calculating of quantity of bottles (trays)

Just I have found my mistake. In FC17 I used Call SFC20 "BLCMOV" and I passed to it wrong parameter SRCBLK:=P#DB5.DBX0.0 byte 2928 but DB5 have length only 480 byte. Therefore I get RET_VAL W#8122 (In helpsystem of Step 7 there is not this value).
 
Why is it that we always have to jump through hoops to do a simple thing like grabbing the PLC time hour when working with S7. Most projects I work on are municipal and they actually specify "MUST USE LADDER LOGIC ONLY". Yet when I work with Siemens it's inevitable.
 

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