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Browse Prior Art Database

Controlling the Removal of Hardware Modules from a Machine Frame

IP.com Disclosure Number: IPCOM000080476D
Original Publication Date: 1973-Dec-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Preiss, RJ: AUTHOR

Abstract

Described is a field replaceable circuit card unit,which premits its replacement during continued computer operation. Only pluggable modules which are not currently active in the computer system can be removed for replacement or repair.

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Controlling the Removal of Hardware Modules from a Machine Frame

Described is a field replaceable circuit card unit,which premits its replacement during continued computer operation. Only pluggable modules which are not currently active in the computer system can be removed for replacement or repair.

Figs. 1 and 2 show different types of detents for use with removable modules. In Fig. 1, the removable module (i.e., circuit card) has a mechanical detent, which is released to permit removal of the circuit card only when an electromagnet in the card socket is energized through a positive identification action generated by a computer diagnostics program, activated by a machine check interrupt in the system operation. For example in Figs. 1 and 2, circuit breaker switch contacts are associated with the module. The circuit breaker is tripped by an error location routine in the diagnostics program, when it isolates a current machine failure to a circuit fault in this module. The tripping of the breaker acts as a memory indicating that this module has been operationally removed from the active subsystem, its circuit power turned off, that this module needs replacement, and that its detent is released by power being supplied on its error-power lead.

A removal indicating light may be shunted across the operational power lead through the circuit breaker. It lights up upon activation of the circuit breaker. The light provides positive identification of the module that is rem...