Browse Prior Art Database

Power Control Interlock Principle

IP.com Disclosure Number: IPCOM000101290D
Original Publication Date: 1990-Jul-01
Included in the Prior Art Database: 2005-Mar-16
Document File: 4 page(s) / 95K

Publishing Venue

IBM

Related People

Fiemeyer, P: AUTHOR [+4]

Abstract

Disclosed is an interlocking mechanism that allows a sophisticated powering control of two associated machines 1 and 2, depending on their selected functional modes.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 69% of the total text.

Power Control Interlock Principle

       Disclosed is an interlocking mechanism that allows a
sophisticated powering control of two associated machines 1 and 2,
depending on their selected functional modes.

      Power ON/OFF of both machines can be simultaneous from orders
received by any one of them. Power ON/OFF can be separated in Local
Mode for safety reasons.

      Assuming the first machine 1 is a Communication Controller of
the IBM 3745 family, the proposed protocol is to be installed in an
external machine 2, without any change of the existing interfaces in
the first machine.

      As shown in Fig. 1, the interlocked machines 1 and 2 provide
two independent interfaces:
1. EPO (Emergency Power Off) is the standard interface allowing a
machine to be externally powered, e.g., by a Host system through the
signals POWER HOLD, POWER PICK and SEQUENCE COMPLETE shown in Fig. 1.
2. CRP (Customer Remote Plug) is a device reflecting the powering
status of a machine.
      Two different powering modes are foreseen:
      1. Local Mode: The machines are independently and locally
controlled, e.g., by a Panel. In this mode, for safety reasons, any
automatic restart is not allowed.
2. Remote Mode: Both machines are powered ON/OFF from orders received
by any one of them.
The Power Control circuits of both machines are always powered, even
when the machine powering status is Power OFF.
      1. Command from the External Machine 2:

      After ...