Baldor E100 manual Special functions on inputs DIN1 and DIN2, Fast position capture

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NextMove e100 / controller		User		MicroFlex e100
		supply
	‘X11’	24V
UDN2982			‘X3’
9	USR V+
Mint
OUTX.0	DOUT0		DIN1+
1				16
10k	USR		DIN1-	6
				TLP115A
10	GND
			Shield
				10
	User
	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 real-time and read using the Mint keyword FASTPOS. or FASTENCODER. The input can configured using the FASTLATCHEDGE keyword to be triggered either on a rising or falling edge. Further control of position capture is provided by the

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.

5-8 Input / Output MN1942