Reference Manual

PMAC 2 Software Reference

PMAC Program Command Specification 329

See Also

How PMAC Executes a Motion Program, Synchronous Variable Assignment (Writing a

Motion Program)

Program Commands I{constant}=, P{constant}=, Q{constant}=,

M{constant}=.

M{constant}&={expression}

Function

M-Variable And-Equals Assignment

Type

Motion program (PROG and ROT)

Syntax

M{constant}&={expression}

where:

• {constant} is an integer constant from 0 to 1023 representing the number of the

M-variable.

• {expression} is a mathematical expression representing the value to be

‘ANDed’ with this M-variable.

Remarks

This command is equivalent to M{constant}=M{constant}&{expression},

except that the bit-by-bit AND and the assignment of the resulting value to the M-

variable do not happen until the start of the actual execution of the following motion

command. The expression itself is evaluated when the program line is encountered, as in

a non-synchronous statement.

Note:

This command may not be used with any of the thumbwheel-multiplexer

forms of M-variables (TWB, TWD, TWR, or TWS), or with any of the

double-word forms (L, D, or F).

Remember that if you use this M-variable in further expressions before

the next move in the program is started, you will not get the value

assigned in this statement.

Example

M20&=$FE ; Mask out LSB of byte M20

M346&=2 ; Clear all bits except bit 1