Allen-Bradley MicroLogix 1100 Instruction Set Reference Manual

Publication 1763-RM001C-EN-P - October 2009
210 Conversion Instructions
GCD - Gray Code
Instruction Type: output
The GCD instruction converts Gray code data (Source) to an integer value
(Destination). If the Gray code input is negative (high bit set), the
Destination is set to 32767 and the overflow flag is set.
Addressing Modes and File Types are shown in the following table:
Updates to Math Status Bits
GCD
Gray Code
Source I1:2.0
225<
Dest N7:1
190<
GCD
Execution Time for the GCD Instructions
Controller When Rung Is:
True False
MicroLogix 1100 29.06 μs 0.87 μs
GCD Instruction Valid Addressing Modes and File Types
For definitions of the terms used in this table see Using the Instruction Descriptions on page 4-2.
Parameter
Data Files Function Files
CS - Comms IOS - I/O DLS - Data Log
Address
Mode
Address Level
O I S B T, C, R N F ST L MG, PD RI/RIX PLS RTC HSC PTO, PWM STI EII BHI MMI LCD Immediate Direct Indirect Bit Word Long Word Element
Source •• ••• • • ••
Destination • • • • • •
• ••
Math Status Bits
With this Bit: The Controller:
S:0/0 Carry always reset
S:0/1 Overflow set if the Gray code input is negative, otherwise is reset
S:0/2 Zero Bit set if the destination is zero, otherwise reset
S:0/3 Sign Bit always reset
S:5/0 Overflow Trap set if the Overflow Bit is set, otherwise reset
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Allen-Bradley MicroLogix 1100 Specifications

General

Brand	Allen-Bradley
Model	MicroLogix 1100
Category	Controller
Language	English