Processing Performance

Introduction

This chapter provides information about the Modicon M262 Logic/Motion Controller processing performance.

Logic Processing

This table presents logic processing performance for various logical instructions:

IL Instruction Type	Duration for 1000 Instructions (μs)
IL Instruction Type	TM262L01MESE8T TM262L10MESE8T TM262M05MESS8T TM262M15MESS8T	TM262L20MESE8T TM262M25MESS8T TM262M35MESS8T
Addition/subtraction/multiplication of INT	5	3
Addition/subtraction/multiplication of DINT	5	3
Addition/subtraction of REAL	11	6
Multiplication of REAL	14	7
Division of REAL	39	20
Operation on BOOLEAN, for example, Status:= Status and value	12	6
LD INT + ST INT	6	3
LD DINT + ST DINT	6	3
LD REAL + ST REAL	6	3

Retain and Retain-Persistent Performance

The retain and retain-persistent variables are saved in a dedicated memory, see NVRAM Memory Organization. Each read/write access to these variables, impacts the cycle time.

This table presents the performance impact of retain and retain-persistent variables on cycle time during POU execution:

IL Instruction Type	Duration for 1000 variables (μs)
IL Instruction Type	TM262L01MESE8T TM262L10MESE8T TM262M05MESS8T TM262M15MESS8T	TM262L20MESE8T TM262M25MESS8T TM262M35MESS8T
READ 1000 INT	434	377
WRITE 1000 INT	418	359
READ 1000 BYTE	434	377
WRITE 1000 BYTE	419	359
READ1000 DINT	662	685
WRITE 1000 DINT	699	539

Communication and System Processing Time

The communication processing time varies, depending on the number of requests sent and received.

Response Time on Event for Embedded Input

The response time presented in the following table represents the time between a signal rising edge on an input triggering an external task and the edge of an output set by this task:

Minimum	Typical	Maximum
60 μs	80 μs	100 μs