Yaskawa MP940 Bedienungsanleitung PDF herunterladen (Seite 57)

100

101

Basic System Operation

3.3.1

Overview of Scan Processing

3-10

3.3 Scan Processing

3.3.1 Overview of Scan Processing

There are three types of MP940 scan processing: S (system) scans, H (high-speed) scans,

and L (low-speed) scans. Scan processing is executed using time slicing within the S-scan

cycle, with the S scan as the basic cycle.

Background processing time for PP processing must be ensured by setting a ratio for alloca-

tion to background processing within the S scan cycle.

 Types of Scans

 Service Scans for Each Function

Except for SVA, the scan for executing I/O processing can be selected for each function.

Scan Type Details

S scan (system scan) • Basic cycle for scan processing: Select 0.5, 1.0, 2.0, or

4.0 ms.

• S, H, and L scan processing is all executed with time slic-

ing within the S-scan cycle.

H scan (high-speed scan) • Set as an integer multiple of S-scan cycle.

• Executed with time slicing within S-scan cycle.

L scan (low-speed scan) • Set as an integer multiple of S-scan cycle.

• Executed with time slicing within S-scan cycle.

Function

Scans Possible for

Servicing

Remarks

CNTR S/H/L Processed in sync with S, H, or L.

LIO (DI/DO/AI/AO) S/H/L Processed in sync with S, H, or L.

MECHATROLINK

(distributed I/O, etc.)

H/L Processed in sync with H, or L.

SVA S/H Scan fixed (not selectable).

Parameters can be set to select synchronization with the

Phase Control Mode and the Position Control Mode.

Phase Control Mode Synchronization Selection

(OBC0016)

0: H scan (default); 1: S scan

Position Control Mode Parameter Synchronization

Selection (OBC0017)

0: H scan; 1: S scan (default)

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