Intelligent Motion Systems Modular LYNX System manual E D i f f e r e n t i a l I / O

T h e D i f f e r e n t i a l I / O

Modular

Quadrature

Channel A

Channel B

Step Clock/Direction

Step Clock

Direction

Up/Down

CW

CCW

Figure 6.4: Clock Functions

T h e C l o c k I n t e r f a c e

The LYNX has four clock pairs that are used by the high speed I/O. One of these, clock pair 11 and 12, is fixed as an output and is used internally to provide step clock and direction pulses to Step Clock and Direction outputs located on Connector P1 of the LYNX Controller. The step clock output increments CTR1 (Counter 1). CTR1 may be read from or written to by software instructions in either program or immediate mode. The following table explains the clocks, as well as their default I/O line pair placement.

C l o c k Ty p e s D e f i n e d

There are three basic types of clocks that may be configured for the LYNX, they are:

1] Quadrature

2] Step/Direction

3] Up/Down

These clock functions are illustrated in figure 6.4.

Q u a d r a t u r e

The quadrature clock function is the most commonly used input clock function. This is the default setting for each high speed I/O channel except 11 & 12. This clock function will typically be used for closed loop control (encoder feedback) or for following applications

LYNX System

S t e p / D i r e c t i o n

The step/direction clock funtion would typically be used in an application where a secondary or tertiary clock output is required to sequentially control an additional axis.

U p / D o w n

The up/down clock type would typically be used as an output function where a secondary axis is being driven by a stepper or servo drive with dual-clock direction control circuitry.

The Four Clocks

Clock #	I/O Line Pair	Slot Position	Counter	Function
				This clock is internally generated motion clock.
1	11 & 12	None	CTR1	It provides step clock and directional control to
				the driver section. This clock is not available
				on any external connector.
				May be configured as an input or output. By
2	13 & 14	Slot 2	CTR2	default this is configured as a quadrature input.
				It can be configured as a secondary clock
				output electronically geared to CLK1.
				May be configured as an input or output. By
3	15 & 16	Slot 3	CTR3	default this is configured as a quadrature input.
				It can be configured as a tertiary clock output
				electronically geared to CLK1.
				May be configured as a high speed input or an
	17	Slot 2	None	output. As an output it is a 1MHz reference
4				clock.
				May be configured as a high seed input or
	18	Slot 3	None	output. As an output it is a 10MHz reference
				clock.

Table 6.5: The Four Clocks and Their Default Line Placement

Modular LYNX System 12.05.2003 1 - 31