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4-10 Input / Output MN1901
capture. To prevent subsequent inputs causing the captured value to be overwritten, the
interrupt is latched in software. It is necessary to clear the latch before subsequent interrupts
can be detected. See the Mint help file. Both inputs are fitted with Schmitt trigger devices.
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.
Active high: DINx=+ 24VDC (±20%)
CREF=0V
4k7
33pF
HCPL2231
to CPU
Vcc
MintDrive
II
Active low: DINx=0V
CREF=+24VDC (±20%)
1k
10k
DGND
DIN4
CREF
14
7
‘X3’
Figure 32 - X3 pulse and direction / fast digital input circuit
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