IMS MicroLYNX Quick Manual page 46

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F o l l o w i n g a n E x t e r n a l C l o c k ( E l e c t r o n i c G e a r i n g )

The High-Speed Differential I/O Module allows you to configure the

MicroLYNX's primary axis to follow an external clock input.

The hardware connection (Figure 9.8) is almost identical to that

shown for closed loop control, only in this instance instead of

using a quadrature clock input for position monitoring and

maintenance, we will use the encoder input to control the

primary axis.

Using this type of application introduces the HAE (Half Axis

Enable) flag and the HAS (Half Axis Scaling) variable. In half

axis mode the master clock is taken from the CLK2, CLK3 or

CLK4 (I/O channels 13 & 14, 15 & 16 or 17 & 18), which have

the IOS variable configured as inputs, a clock type, and ratio

mode enabled. The primary axis will move as a ratio of this

clock based upon the factor entered in the HAS variable.

H A E

This flag (1) enables and (0) disables half axis scaling mode. The default condition

is (0) disabled. The HAE flag must be enabled for this mode to function.

H A S

The half axis scaling variable is the factor by which the Follower Input: Primary

Axis ratio is scaled. The range of the factor is >-1 to <1. For example, a setting

of HAS=.5 will output 1 pulse on the primary axis for every 2 pulses input to the

follower input or a 2:1 ratio, HAS=.2 will be 5:1, HAS=.999 will be .999:1 and

so on. The default HAS value is 0.000, thus some factor must be entered to make

this function.

C o n f i g u r i n g t h e I / O f o r H a l f A x i s M o d e

The parameter setup to make this configuration follows. This assumes a High-

Speed Differential I/O Expansion Module installed in slot 2. If your module is

installed in slot 3, use I/O channels 15 and 16 (IOS 15=5,0,1,0,1,1 and IOS

16=6,0,1,0,1,1) instead. The raw count of clock pulses will register to CTR3. I/O

channels 17 and 18 can be used for this also, only there is no registration of clock

pulses:

IOS 13=3,0,1,0,1,1

IOS 14=4,0,1,0,1,1

HAE=1

HAS=.5

With this configuration, one (1) step clock pulse will output to the primary axis

for every two (2) input clock pulses.

By reading the value of CTR2 and CTR1 you can see the ratio of the pulses.

Try different HAS variable, motor resolution and MUNIT settings to see how

the primary axis is effected by different settings.

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'I/O 13 quad. input, ratio mode

'I/O 14 quad. input, ratio mode

'Enable half-axis scaling mode

'Half-axis scaling variable to .5 (1 output

'pulse on the pri. axis for 2 input pulses)

For an excellent application

example where half axis mode

is utilized see Section 12: Sample

Applications, Traverse!

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IMS MicroLYNX Quick Manual page 46

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