14
Section 8 - Configurable input error indication and input limits
Configurable input error indication and input limits
8
Configurable input error detection
To increase system safety and integrity, users can program a high and low input error detection level. Input signals outside
the selected error indication levels will cause the output of the device to go to the programmed error state. The error is
indicated in display line 1 as IN.ER and at the same time the backlight flashes.
The two configurable input error detection levels can be set and enabled individually, just as it is possible to individually set
the output error indication for each of the two detection levels. This allows users to differentiate process faults, broken input
wires, etc.
Available output error states for each of the two detection levels are: UP, DOWN, ZERO and NONE.
Output error indication uses the error states defined by NAMUR NE43 for 4...20 mA output span, and for all other output
spans equivalent output error indications are used (see table on page 14).
Example - 4..20 mA output span and both high and low configurable input error limit enabled with output error
indication set to ZERO:
‘Min. selected
input’ - 15%
‘Max. selected
input’ + 15%
Normal measuring range
Output error indication = NONE
Extended measuring range
20.0 mA
4.0 mA
3.8 mA
Normal r
ange
Extended w
orking r
ange
20.5 mA
Input:
ARMS,
VRMS
etc.
Device
Min. input
Configurable input
limit, low
Configurable input
limit, high
Device
Max. input
Error current
Error current
Input:
ARMS,
VRMS
etc.
Normal measuring range
Output error indication = ZERO
Extended measuring range
20.0 mA
4.0 mA
20.5 mA
3.8 mA
Normal r
ange
Extended w
orking r
ange
Output error current can be
individually set to:
ZERO:
0 mA
UP:
23 mA
DOWN:
3.5 mA
DISABLED: No error indication,
output limited to 3.8 mA
Output error current can be
individually set to:
ZERO:
0 mA
UP:
23 mA
DOWN:
3.5 mA
DISABLED: No error indication,
output limited to 20.5 mA
Example - input limits disabled:
