Bosch 6000 User's Guide download pdf (Page 223)

208

6000 Series Programmer's Guide

cycle length is less than the current master cycle position, the new master cycle position

becomes equal to the old cycle position minus one or more multiples of the new cycle length.

Example

Code

FMCLEN23,10,12,22 ; Set master cycle length for all four axes:

; (axis 1: 23 units; axis 2: 10 units;

; axis 3: 12 units; and axis 4: 22 units)

Restart Master Cycle

Counting (FMCNEW or

TRGFNcx1xxxxxx)

Once the length of the master cycle has been specified with the FMCLEN command, master

cycle counting may be restarted immediately with the FMCNEW command, or based on

activating a trigger input as specified with the TRGFNcx1xxxxxx command. The new

master cycle count is started at an initial position specified with the FMCP command (see

below).

When the TRGFNcx1 command is used, the restart of master cycle counting is pending

activation of the specified trigger. If an FMCNEW command is issued while waiting for the

specified trigger to activate, counting is restarted immediately with the FMCNEW command,

and the TRGFNcx1xxxxxx command is canceled.

When using TRGFNcx1xxxxxx

• Before the TRGFN command can be used, you must first assign the trigger interrupt function

to the specified trigger input with the INFNCi-H command, where “i” is the input number of

the trigger input desired for the function (input bit assignments vary by product).

• Because the 6000 controller program will not wait for the trigger to occur before continuing

on with normal program execution, a WAIT or GOWHEN condition based on PMAS will not

evaluate true if the restart of master cycle counting is pending the activation of a trigger.

To halt program operation, the WAIT command can be used.

A new master cycle will restart automatically when the total master cycle length (FMCLEN value)

is reached. This is useful in continuous feed applications.

Example

Code

FMCNEW11xx ; Restart new master cycle counting on axes 1 and 2

INFNC26-H ; Assign input #26 (trigger B) the

trigger interrupt

; function (prerequisite to using the TRGFN features)

TRGFNBx1xxxxxx x1 ; When trigger input B (

TRG-B) goes active,

; restart new master cycle counting on axes 1 and 2

Initial Master Cycle

Position (FMCP)

The FMCP command allows you to assign for the first cycle only, an initial master cycle

position to be a value other than zero. When master cycle counting is restarted with the

FMCNEW command or with the trigger specified in the TRGFNcx1 command, the master cycle

position takes the initial value previously specified with the FMCP command. The value for

FMCP is scaled by SCLMAS if scaling is enabled (SCALE1)

FMCP was designed to accommodate situations in which the trigger that restarts master cycle

counting occurs either before the desired cycle start, or somewhere in the middle of what is to

be the first cycle. In the former case, the FMCP value must be negative. The master cycle

position is initialized with that value, and will increase right through zero until it reaches the

master cycle length (FMCLEN). At that point, it will roll over to zero as usual.

The continuous cut-to-length example below illustrates the use of a negative FMCP (a trigger

that senses the motion of the master is physically offset from the master position at which

some action must take place). If it is desired that the first cycle is defined as already partially

complete when master cycle counting is restarted, the FMCP value must be greater than zero,

but less than the master cycle length.

To give a value for FMCP which is greater than master cycle length is meaningless since

master cycle positions are always less than the master cycle length. The 6000 controller

responds to this case as soon as a new master cycle counting begins by using zero instead of

the initial value specified with FMCP.

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Bosch 6000 User's Guide Page 223

Comments to this Manuals

Bosch 6000 User's Guide Page 223

Comments to this Manuals

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