Operation And Content Of The Clipx-Fifo - HBM ClipX Bedienungsanleitung

8.2

Operation and content of the ClipX-FIFO

Use the ClipX-FIFO to record measurement values over a period of time or during an
interesting process step. The control system can then read out the values via the Ether-
net interface or one of the fieldbuses. You can have the recording performed continu-
ously on a start signal or control it via various trigger conditions. Up to 1000 measured
values (4000 from firmware 2.0) each from 6 different signal sources (gross, net, ClipX
bus, etc.) are recorded. The oldest values are overwritten when all memory locations are
occupied. At the same time the overflow bit is set (FIFO control flags). The maximum
recording speed is 1000 values per second. You can also have recorded a value from all
signal sources every 10 seconds (recording rate 0.1/s) or if the source signal changes
by a certain amount.
With a high CPU load, e.g. during a parameter set change, there is the danger
that no FIFO entries are made. Also the time channel could then contain
wrong values, since the counting up of the milliseconds in the time channel
is also omitted in this case.
You can start a continuous recording or choose between two variants for trigger-con-
trolled recording:
1. Status-controlled filling of the FIFO.
The bit mask of the digital flags determines the filling, see
flags (I/O status)" on page
one of the bits is set and an active difference condition is fulfilled (see Mode of
Operation).
2. Edge controlled filling of the FIFO.
The bit mask of the digital flags determines the filling, see
flags (I/O status)" on page
possible signal sources if one of the bits changes and an active differential condi-
tion is fulfilled. With this function, in contrast to the other mode of operation, the
change of only one bit from High to Low or from Low to High with several already
active bits (High) is also recognized as a trigger.
You also have the following options
1. You can specify that a specific difference from the last stored value must be
exceeded.
As soon as the difference value between the last value stored in the FIFO and the
current value at one of the 6 signal sources is exceeded, the current value of all sig-
ClipX
Operation via Ethernet/OPC UA/PPMP
157. Filling is active if the result is not 0, i.e. if at least
157. 1 measured value is recorded from each of the 6
„Digital flags: List of I/O
„Digital flags: List of I/O
107