User guide

Chapter 19

Comparison Instructions

19–8

MASKED EQUAL

Source B3:10

0100011100000000

Mask 00FF

Compare B3:11

0000000001110101

Masked Comparison for Equal MEQ Input Instruction

MEQ

F1 F2 F3 F4 F5

ZOOM on MEQ –|MEQ|– 2.3.0.0.1

NAME: MASKED EQUAL

SOURCE A: B3:10 0100 0110 0000 0000

MASK: 00FF 00FF

COMPARE: B3:11 0000 0000 0111 0101

EDT_DAT

HHT Ladder Display:

HHT Zoom Display:

Ladder Diagrams and APS Displays:

(online monitor mode)

This input instruction compares data at a source address with data at a

reference address and allows portions of the data to be masked by a separate

word.

Entering Parameters

• Source – the address of the value you want to compare.

• Mask – a hex value or the address of the mask through which the

instruction moves data. Refer to appendix B for more information

regarding masks and hexadecimal numbering.

• Compare – an integer value or the address of the reference.

If the 16 bits of data at the source address are equal to the 16 bits of data at

the compare address (less masked bits), the instruction is true. The

instruction becomes false as soon as it detects a mismatch. Bits in the mask

word mask data when reset, they pass data when set.

Masked Comparison for

Equal (MEQ)