Setting The Switch Points; As-Interface Data - GEM 651 Installation, Operating And Maintenance Instructions

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 %
Stroke
Switch
point
OPEN
Switch
point
CLOSED
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 AS-Interface (as seen from the AS-Interface master)
Bit Function
DI0 Indication of Open position
DI1 Indication of Closed position
DI2 Indication of operating mode
DI3 Error 2
FID Error 1
Outputs AS-Interface (as seen from the AS-Interface master)
Bit Function
DO0 Activation of pneum. outlet 2/4 (c.f. 1, 2)
(activation of pilot valve Y1/Y2)
DO1 Selection of programming mode
DO2 Selection of operating mode
DO3 non existent
Parameter outputs
Bit Function
P0 Setting of switch points
P1 Setting of switch points
P2 Setting of switch points
651
Inputs / outputs
Logic
0 = process valve not in Open position
1 = process valve in Open position
0 = process valve not in Closed position
1 = process valve in Closed position
0 = normal operation
1 = programming mode
see Error analysis table
see Error analysis table
Logic
0 = pneum. outlet 2 vented / outlet 4 pressurized
1 = pneum. outlet 2 pressurized / outlet 4 vented
0 = manual programming
1 = automatic programming
0 = normal operation
1 = programming mode
Logic
see Switch point table
see Switch point table
see Switch point table
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