Baldor MN1274 06/2001 Special functions on inputs DIN0 and DIN2, Breakout board, Input Function

These inputs are isolated and share a single common line (COM). The entire input bank may be configured for use in PNP mode (sinking current, where current flows in to the inputs) by connecting COM to the negative rail of the externally generated power source. Alternatively the entire input bank may be configured for use in NPN mode (current flows out of the inputs) sourcing current by connecting COM to the positive rail of the externally generated power source.

The use of screened/shielded cable with the screen terminated on the D-shell is highly recommended and will improve the inputs’ immunity to interference.

COM (pin 6) controls the sense of all the X5 digital inputs and should be permanently wired, dependent on the user requirements, as described below:

Active high: Connect pin 6 to 0V.

The digital inputs will be active when a voltage of +24VDC (+10VDC to +30VDC) is applied to them and will sink a maximum of 20mA.

Active low: Connect pin 6 to +24VDC.

The digital inputs will be active when grounded (less than 2VDC) and will source a maximum of 20mA. (To eliminate any possible errors, designs should ideally provide a “grounded” voltage of less than 1V).

The +24VDC supply mentioned above is from an externally generated 24VDC supply with an adequate current capability to fulfill all the current requirements of the above loads. The sense of the inputs can also be controlled individually in Mint using the keyword INPUTACTIVELEVEL.

The inputs are compatible with mechanical switches or open-collector drivers. They are not, however, compatible with external push-pull drivers unless an external diode is fitted, which effectively converts a push-pull driver into an open collector driver.

There is a hardware propagation delay of 10µs or less between applying an external voltage and the switch becoming active (ON). Similarly, there is a delay of 50µs or less for the device to switch OFF when removing an external voltage.

3.3.2.1Special functions on inputs DIN0 and DIN2

DIN0 and DIN2 can be configured using the FASTAUXSELECT keyword to perform special functions:

Input	Function
DIN0	Configurable as the fast interrupt (FASTIN) hardware position capture input. The
	position of the axis is captured in real time and can be read using the Mint keyword
	FASTPOS. DIN0 can also be configured to capture the auxiliary encoder input as well
	as the axis position input. Fitted with a Schmitt trigger device.
DIN2	Similar to DIN0, but captures the master or auxiliary encoder input which can be
	read using the Mint FASTAUXENCODER keyword.
	Fitted with a Schmitt Trigger device.

3.3.2.2Breakout board

Connector X5 can also be connected to an I/O supporting break-out board (giving screw-terminal type connections and local filtering). The Baldor catalog number for this item is OPT017-501. See page 48.

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