I claim:
1. A method for accommodating a logic controller to interface to a plurality of types of inputoutput expansion modules, comprising the steps of:
providing a common physical configuration for accommodating the plurality of types of inputoutput expansion modules;
establishing a first mode of operation to accommodate signals associated with a first type of inputoutput expansion module; and
establishing a second mode of operation to accommodate signals associated with a second type of inputoutput expansion module.
2. The method according to claim 21, further comprising the steps of:
assigning a first portion of said common physical interface to a first type of signal of a first type of inputoutput expansion module according to said first mode; and
reassigning said first portion of said common physical interface to a second type of signal of a second type of inputoutput expansion module according to said second mode.
3. The method according to claim 22, further comprising the steps of:
assigning a second portion of said common physical interface to a third type of signal of said first type of inputoutput expansion module according to said first mode; and
reassigning said second portion of said common physical interface to a fourth type of signal of said second type of inputoutput expansion module according to said second mode.
4. The method according to claim 21, wherein said step of establishing a first mode of operation assigns a portion of said common physical interface to receive an input signal.
5. The method according to claim 24, wherein said step of establishing a second mode of operation reassigns said portion of said common physical interface to sendreceive a bi-directional signal.
6. The method according to claim 24, wherein said step of establishing a first mode of operation assigns another portion of said common physical interface to transmit an output signal.
7. The method according to claim 24, wherein said step of establishing a second mode of operation assigns another portion of said common physical interface to receive address and control signals.
8. The method according to claim 217 wherein the step of providing a common physical configuration provides a same port for relating signals associated with said plurality of types of inputoutput expansion modules.
9. The method according to claim 21, further comprising the step of establishing a common bus transaction scheme for communicating signals associated with said plurality of types of inputoutput expansion modules.
10. The method according to claim 29, wherein the step of establishing a common bus transaction scheme is employed for both read and write bus transactions.
11. The method according to claim 21, further comprising the step of establishing a common parity checking scheme for said plurality of inputoutput expansion modules for checking the parity of signals communicated between said logic controller and said inputoutput expansion modules.
12. The method according to claim 31, wherein step of establishing a common parity checking scheme is employed for both read and write bus transactions.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. An exhaust gas recirculation valve comprising a body having a fluid passage through which an exhaust gas flows, a valve arranged in the fluid passage that switches a flow through state of the exhaust gas, at least a portion of an outer peripheral surface of the valve being spherically shaped, a seat member having a seat section, which is disposed in the fluid passage on an upstream side from the valve and on which the valve is seated, and a shaft connected to the valve and which rotates the valve,
wherein a percentage of an eccentricity amount between a center of curvature of the valve when the valve is completely closed and an axis of the shaft along a direction of flow of the exhaust gas with respect to a diameter of an inlet port formed in the body and into which the exhaust gas flows is 5.5% or greater.