Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 692)

Paramacros
Chapter 28
28-18
When the control executes this block, a cycle stop is performed and the
message “SEE PART PROGRAM FOR MACRO STOP MESSAGE” is
displayed on line 1 of the CRT. This is intended to point out to the
operator an important comment in the program block that assigns a value
to parameter 3000 (see chapter 10 on comment blocks).
For example, programming
#3000=.1 (TOOL NUMBER 6 IS WORN);
causes program execution to stop at the beginning of this block and
displays a message telling the operator to read the comment in the block.
A block reset must be performed before a cycle start will resume normal
program execution.
When this block is executed, it also sets the paramacro alarm PAL flag
($MCALRM) true. Refer to the system installer’s documentation for
details on the effect of this PAL flag.
#3001
System Timer (PAL)
This parameter is referred to as the timer parameter. It is a read-write
parameter. Every 20ms a value of 20 is added to the value of parameter
3001. The value of this parameter is also stored by a PAL flag
($PM20MS) and may be modified or set by the system installers PAL
program. Refer to the system installer’s documentation for details on the
use of this timer. The maximum value of this parameter is 32768ms. Any
value greater than 32768 will cause this parameter to “rollover” to zero and
restart counting again. The value of this parameter is reset to zero every
time power is lost.
#3002
System Clock
This parameter is referred to as a clock parameter and references an hour
counter. It is a read-write parameter with negative value assignments being
illegal. The maximum value for this parameter is 1 year (8760 hours).
The parameter value is maintained when power is lost. It is incremented
by .000005556 every 20 ms.