S7Guy said:
Jesper, what did you find ambiguous with those questions? The only one that I had to think twice on was the one that asked what a valid analog address would be for the S7300 PLC. In the 400, you can change the PI area range, so both PIW128 and PIW256 could be true. But if only one of them could be true, then it would have to be PIW256.
Warning, dont read this if you havent done the test as it could spoil it for you.
1: "What is the name of the primary programming port on an S7 CPU?"
Answer d: "MPI"
Answer e: "MPI-DP".
As some CPUs have a MPI/DP port, then the last answer could be interpreted as "MPI
or DP".
8: "What is a valid analog input address for an S7 300 series controller?"
Answer c: "PIW128"
Answer e: "PIW256"
You can set an analog input to within the proces image, and you can load a P address even if it is inside the proces image.
The question is only for if it is a valid address, not if it makes sense.
9: "When is the PII updated?"
Answer a: "Prior to execution of OB1"
Answer c: "At the end of execution of OB1"
Obviously the whole sequence runs around in cycles. I have also seen some official statements that the cycle is OB1 - PIQ - PII - OB1 etc.
12: "What is the prefix for a timer preset variable?"
Answer c: "T#"
Answer d: "S5T#"
T# (TIME) is as valid as S5T# if you consider a timer preset for an IEC timer. Remember that the IEC timers are always available (as SFBs).