Browse Prior Art Database

Digital Input/Output Local Area Network Node Card

IP.com Disclosure Number: IPCOM000060372D
Original Publication Date: 1986-Mar-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 54K

Publishing Venue

IBM

Related People

Eng, RC: AUTHOR

Abstract

A technique is described whereby a digital Input/Output (I/O) Local Area Network (LAN) node card provides digital sensor I/O capabilities for applications as used in remotely located industrial process control systems. The node card has the ability to switch external devices on or off and to determine the on or off state of external electrical devices. Commands are sent via LAN cable 10, as shown in Fig. 1, by host computer 11 to node cards 12 so as to switch or detect conditions of electrical devices 13 attached to node cards 12. The node card, as shown in Fig. 2, consists of a LAN interface 14, a microprocessor controller 15 with associated Random-Access Memory (RAM) and Read-Only Memory (ROM) 16 which are designed to control and oversee the functions of the node card.

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Digital Input/Output Local Area Network Node Card

A technique is described whereby a digital Input/Output (I/O) Local Area Network (LAN) node card provides digital sensor I/O capabilities for applications as used in remotely located industrial process control systems. The node card has the ability to switch external devices on or off and to determine the on or off state of external electrical devices. Commands are sent via LAN cable 10, as shown in Fig. 1, by host computer 11 to node cards 12 so as to switch or detect conditions of electrical devices 13 attached to node cards 12. The node card, as shown in Fig. 2, consists of a LAN interface 14, a microprocessor controller 15 with associated Random-Access Memory (RAM) and Read-Only Memory (ROM) 16 which are designed to control and oversee the functions of the node card. Digital I/O interface 17 allows up to thirty-two I/O modules 18 to be used as interface points to external electrical devices. I/O modules 18 are user selectable based on external circuit voltage, current, and interface requirements of the attached external devices. They provide an electrically isolated Transistor- Transistor- Logic (TTL) level, AC or DC voltage interface. The node card has the ability to manage digital I/O ports based on commands communicated via LAN connection 10. LAN communications are received through LAN interface 14, which is matched to the IBM Personal Computer cluster baseband. This communications link allows commands and...