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NextMove e100 / controller |
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| MicroFlex e100 |
| supply |
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| ‘X11’ | 24V |
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UDN2982 |
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| ‘X3’ |
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9 | USR V+ |
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Mint |
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OUTX.0 | DOUT0 |
| DIN1+ |
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1 |
| 16 | ||
10k | USR |
| DIN1- | 6 |
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| TLP115A | |
10 | GND |
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| Shield |
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| 10 | |
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| supply | Connect overall | ||
| GND |
| shield at one end only |
Figure 29 - Digital input - typical connection from a Baldor NextMove e100
5.2.4 Special functions on inputs DIN1 and DIN2
DIN1 and DIN2 can be configured to perform special functions.
5.2.4.1Fast position capture
DIN1 or DIN2 can be configured using the FASTSELECT keyword to become a fast latch input. This allows the position of the axis to be captured in
FASTLATCH and FASTLATCHMODE keywords.
The maximum latency to read the fast position depends on the feedback device. For an incremental encoder, the latency is approximately 150 - 300ns. For other feedback devices latency may be up to 62.5µs, resulting from the 16kHz sampling frequency used for these types of feedback device. The fast interrupt will be latched on a pulse width of about 30µs, although a width of 100µs is recommended to ensure capture. To prevent subsequent inputs causing the captured value to be overwritten, the interrupt is latched in software.
Note: The fast inputs are particularly sensitive to noise, so inputs must use shielded twisted pair cable. Do not connect mechanical switches, relay contacts or other sources liable to signal ‘bounce’ directly to the fast inputs. This could cause unwanted multiple triggering.
MN1942 |