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Field Engineering
Theory of Operation




For Sale Through IBM Branch Offices




We are pleased to send you this ~om
plimentary copy of a newly '!rmted
publication. Additio!'al. copies are
available from the Distribution Cen-
ter, Mechanicsburg.

G. W. Goesch, Manager
Department G24

Author: C. S. Williams




TI@@@ Data Acquisition and Control System
Processor-Controller



SY26-5912-4
Field Engineering
Theory of Operation




For Sale Through IBM Branch Offices




Data Acquisition and Control System
Processor-Controller



SY26-5912-4
Preface



System diagrams (logics) at the engineering change The Maintenance Diagram Manual supplied with
level of the 1800 system are included in each system the 1800 system is intended to be used with this
shipment. manual, The Maintenance Diagram Manual contains
To fully understand the material presented in text, flow charts, timing charts, and various sup-
this manual, the reader should have a general knowl- plementary diagrams that assist in understanding the
edge of Process Control Systems and should be logical operations described in this manual. Page
familiar with Solid Logic Technology (SL T) packag- references, shown as (CS50101), refer to page
ing and documentation. numbers in the FEMDM. Page coordinates,
This manual contains a comprehensive introduc- e. g., E4, may follow the page reference. Page
tion to the IBM 1800 Data Acquisition and Control references which have only five characters,
System, and specific descriptions of the IBM 1801 shown as (SA041), refer to page numbers in the
and 1802 Processor-Controllers. The input/output ALDs.
features and adapters are described in these addi- Maintenance information for the Processor-
tional manuals: IBM Field Engineering Theory of Controller and its adapters is available in the IBM
Operation, 1800 Data Acquisition and Control Sys- FE Maintenance Manual, 1800 Data Acquisitioii'liiid
tem, Data Processing Input/Output Features, Order Control System, Order No. SY26-5956.
No. SY26-3617, IBM Field Engineering Theory of other Manuals, useful in understanding and
Operation, 1800 Data Acquisition and Control System, maintaining the 1800 system, are listed in the IBM
Process Input/Output Features, Order No. SY26- Field Engineering Bibliography, 1800 Data Ac~
5959, and IBM Field Engineering Maintenance tion and Control System, Order No. SY26-0560.
Diagrams, 1800 Data Acquisition and Control System, The appendixes of this manual contain special
Volume 1, Order No. SY26-4128, and Volume 2, circuit descriptions, and other information of a
Order No. SY26-4129. supplementary nature.


Fifth Edition (February 1970)

This manual revises and makes obsolete the previous edition, Order No. SY26-59 12-3.
Changes to the text and illustrations are not indicated because of extensive rearrange-
ment. Material was added for the 1803 Core Storage Unit, Communications Adapter,
Selector Channel and Expanded Data Channel. Review the entire manual with emphasis
on added material and addressing of auxiliary core storage with modifier bit 9. The MPX
(Programming System) utilizes modifier bit 9 to address auxiliary storage with the fol-
lowing instructions: Store Accumulator, Load Accumulator, Logical AND, Logical OR,
and Logical Exclusive OR.
Manuals referred to in this publication that have an Order No. with a four character
prefix are identical in content to the same manual without the initial prefix character.
(e.g. SY26-xxxx is the same in content as Y26-xxxx.)

Significant changes or additions to the specifications contained in this publication ar6
I
continually being made. When using this publication in connection with the operati6n
of IBM equipment, check the latest FE Publications Systems Sequence iListing, Ord~r No.
SY20-0073, for revisions or contact the local IBM Branch Office.

The illustrations in this manual have a code number in the lower corner. This is a
publishing control number and is not related to the subject matter.

Copies of this and other IBM publications can be obtained through IBM Branch O~fices.

A form for reader's comments is provided at the back of this pUblication. If the form
has been removed, send your comments to the address below.

This manual was prepared by the IBM Systems Development DiVision, Product
Publications, Department G24, San Jose, California 95114.

(9 Copyright International Business Machines, 1965.

ii (2/70)
Contents


ABBREVIATIONS . . . . . . . . . . . . . . . . . . . . . . . . . v Inhibit/Sense - Two-IJ.sec Storage