GEM 651 - AS-Interface Data; Setting the Switch Points

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14.5 Setting the switch points
GEMÜ 651 provides the possibility of proportionally setting the switch points for the OPEN
and CLOSED feedback to the programmed stroke.
Example: Switch point OPEN 25 %,
Switch point CLOSED 12 %
Switch
point
OPEN
Switch
point
CLOSED
Stroke
These switch point distances enable compensation of operational changes such as
diaphragm swelling during sterilisation and thus ensure reliable end position feedback.
The switch points can be set via the parameter bits (see table "Switch points" in chapter
14.6 "AS-Interface data" ).
14.6 AS-Interface data
Inputs / outputs
Inputs AS-Interface (as seen from the AS-Interface master)
Bit Function Logic
DI0 Indication of Open position 0 = process valve not in Open position
1 = process valve in Open position
DI1 Indication of Closed position 0 = process valve not in Closed position
1 = process valve in Closed position
DI2 Indication of operating mode 0 = normal operation
1 = programming mode
DI3 Error 2 see Error analysis table
FID Error 1 see Error analysis table
Outputs AS-Interface (as seen from the AS-Interface master)
Bit Function Logic
DO0 Activation of pneum. outlet 2/4 (c.f. 1, 2)
(activation of pilot valve Y1/Y2)
0 = pneum. outlet 2 vented / outlet 4 pressurized
1 = pneum. outlet 2 pressurized / outlet 4 vented
DO1 Selection of programming mode 0 = manual programming
1 = automatic programming
DO2 Selection of operating mode 0 = normal operation
1 = programming mode
DO3 non existent
Parameter outputs
Bit Function Logic
P0 Setting of switch points
see Switch point table
P1 Setting of switch points
see Switch point table
P2 Setting of switch points
see Switch point table