IFM Electronic CR0403 Programming Manual page 20

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System description
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Output group Q0 (OUT0, OUT1)
These outputs are a group of multifunction channels.
These outputs provide several function options (each output separately configurable):
• binary output, plus switching (BH) with diagnostic function and protection
• analogue current-controlled output (PWMi)
• analogue output with Pulse Width Modulation (PWM)
Possible operating modes inputs/outputs
→ chapter
► Configuration of each output is made via the application program:
OUTPUT
→ FB (→ page 180)> input MODE
PWM output: → FB
Current control and load current indication → FB
► For the limit values please make sure to adhere to the data sheet!
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Diagnosis: binary outputs (via current and voltage measuring)
The diagnostics of these outputs is made via internal current and voltage measurement in the output:
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Diagnosis: overload
Overload can only be detected on an output with current measurement.
Overload is defined as ...
"a nominal maximum current of 12.5 %" according to the data sheet.
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Diagnosis: wire break (via current measurement)
Wire-break detection is done via the read back channel. When the output is switched (Qn=TRUE) wire
break is detected when no current flows on the resistor Ri (no voltage drops). Without wire break the
load current flows through the series resistor Ri generating a voltage drop which is evaluated via the
read back channel.
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Diagnosis: wire break (via voltage measurement)
Wire-break detection is done via the read back channel. When the output is blocked (Qn=FALSE) wire
break is detected when the resistor Ru pulls the read back channel to HIGH potential (VBB). Without
the wire break the low-resistance load (RL < 10 kΩ) would force a LOW (logical 0).
BasicController (CR0403) Runtime System V03.02
PWM1000
(→ page 182)
(→ page 207)
CURRENT_CONTROL
Figure: principle block diagram
(1) Output channel
(2a) Read back channel for diagnosis via current measuring
(2b) Read back channel for diagnosis via voltage measuring
(3) Pin output n
(4) Load
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2015-04-01
Hardware description
(→ page 178)
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