Comparison OperationsBeginnerIEC 61131-3

GE (Greater Than or Equal)

Returns TRUE when first input is greater than or equal to second input.

The GE (Greater Than or Equal) comparison function returns TRUE when the first input is greater than or equal to the second input. It is commonly used for setpoint comparisons, minimum threshold checks, and range validation in PLC programs.

Parameters

Inputs

Name	Type	Description
IN1	ANY_NUM	First value
IN2	ANY_NUM	Second value

Outputs

Name	Type	Description
OUT	BOOL	TRUE when IN1 >= IN2

Ladder Logic Example

// Ladder Logic - GE Comparison
//
// |----[GE]---( Level_OK )----|
// | IN1: Tank_Level            |
// | IN2: Min_Level (20.0)      |

Structured Text Example

Level_OK := (Tank_Level >= Min_Level);

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Platform-Specific Implementation

Siemens (TIA Portal)

Use CMP >= instruction in TIA Portal.

Allen-Bradley (Studio 5000)

Use GEQ (Greater Than or Equal) instruction.

CODESYS

Use >= operator in ST or GE function block.

Common Applications

Minimum level/threshold checks
Setpoint reached detection
Permit conditions
Batch quantity verification

Frequently Asked Questions

What is GE (Greater Than or Equal) in PLC programming?

Returns TRUE when first input is greater than or equal to second input. The GE (Greater Than or Equal) comparison function returns TRUE when the first input is greater than or equal to the second input. It is commonly used for setpoint comparisons, minimum threshold checks, and range validation in PLC programs.

What are common applications of GE (Greater Than or Equal)?

GE (Greater Than or Equal) is commonly used for: Minimum level/threshold checks, Setpoint reached detection, Permit conditions, Batch quantity verification.

How do I use GE (Greater Than or Equal) in different PLC platforms?

Siemens: Use CMP >= instruction in TIA Portal. Allen-Bradley: Use GEQ (Greater Than or Equal) instruction. CODESYS: Use >= operator in ST or GE function block.