Browse Prior Art Database

Variable Stop Time Motion Control Diagnostic

IP.com Disclosure Number: IPCOM000073624D
Original Publication Date: 1971-Jan-01
Included in the Prior Art Database: 2005-Feb-22
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Edstrom, G: AUTHOR [+2]

Abstract

It is desired to analyze the stopping time of a magnetic media drive system. A CPU channel connected to a control unit sends variable go-down time commands, each command having a number indicating the desired stop time. Such command is a part of an on-line test program (OLT). The OLT supplies the channel command to a control unit which then interprets the command for providing a specified stopping time.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 98% of the total text.

Page 1 of 1

Variable Stop Time Motion Control Diagnostic

It is desired to analyze the stopping time of a magnetic media drive system. A CPU channel connected to a control unit sends variable go-down time commands, each command having a number indicating the desired stop time. Such command is a part of an on-line test program (OLT). The OLT supplies the channel command to a control unit which then interprets the command for providing a specified stopping time.

A typical use of this idea is in a chained sequence of several commands, each with a different delay, such a sequence is: I) Set Diagnostic mode.

2) Write command is issued.

3) Go-down time command (Time = X1).

4) Write.

5) Go-down time command (Time = X2).

6) Write.

7) Go-down time command (Time = X3).

8) Write.

9) Go-down time command (Time = X4).

10) Write.

The set diagnostic mode command is such that it selects the microcode diagnostic program sequence where the go-down time command is located. Normal data processing (read or write) commands are performed without modification. The above example used a write command.

This reliability test is performed while the subsystem is connected to the CPU to provide absolute control over delay between successively processed commands. The command may be incorporated into the subsystem either by microcode or by hardware. The control unit must interpret the commands and actuate its motion control circuits such that stopping time is varied in accordance with the number supplied wit...