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NIM Primitives

4-37

SIMATIC TIWAY I Series 500 NIM User Manual

Availability: Releases 1.1, 2.1, 2.2, and 3.0

Primitive 20 is a command to read a single contiguous block of data in the

Secondary device. Read Block will access contiguous data element locations

from a given data element location.

Request: LLLL 20 TT NNNN AAAA

Symbol Value Definition

TT Data element type

NNNN Number of locations

AAAA Data element location

Response: LLLL 20 HH DD ... DD

(repeated)

Symbol Value Definition

HH Attached device operational status

DD Data

Read Block

Primitive – Code 20

1 2 ... 85 86 87 88 89 90 91 92 93 94 95 ... 137 138

   1
   1
MANUAL PUBLICATION HISTORY 3
LIST OF EFFECTIVE PAGES 4
Contents 5
Chapter 4 NIM Primitives 6
Contents v 7
List of Figures 8
List of Tables 9
TIWAY I Overview 12
1.1 TIWAY I System Overview 13
Network Design Considerations 19
2.4 Local Line Biasing 33
Installation 36
3.1 General Requirements 37
3.2 Installing the NIM 38
3.4 Setting the Dipswitches 41
3.5 Series 500 NIM Self Tests 49
3.6 Module Login Verification 52
4.1 TIWAY I Primitives 55
4.2 Primitive Functions 56
 59
 59
 59
4.4 Primitive Logical Groups 62
** Format 67
2x, 3x, and 4x = IBM format 67
6x, 7x, and 8x = IEEE format 67
 86
 94
(repeated) 96
NIM Primitives 101
      102
 102
Download Examples 111
Primitives 111
PM550 CIM Requirements 118
A.1 Introduction 119
A.2 Local Line Length 120
Floating Point Numbers 123
B.1 Introduction 124
B.2 IBM Format 125
IBM Format (continued) 126
 126
B.3 IEEE Format 127
IEEE Format (continued) 128
Appendix C 129
DATA DEFINITION TABLE 130
Network Evaluation Form 131
Specifications 133
Primitive Examples 134
Customer Response 136
FIRST CLASS 137
PERMIT NO.3 137
JOHNSON CITY, TN 137

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