B

2.Add the contribution of each I/O module in the remote drop. For discrete input modules, the contribution is either 36 bytes for modules with catalog numbers IC697MDL2nn (for example, IC697MDL241) or 42 bytes for modules with catalog numbers IC697MDL6nn.

3.Include 50 bytes as the contribution of the Remote I/O Scanner itself.

4.Option (PCM, GDS, ADS) modules do not have I/O configuration data, so they are not included in the calculation. Chapter 1 explains how many option modules can be in a remote drop.

Example 1

A remote drop has 10 discrete input modules with model numbers IC697MDL2nn and 14 with model numbers IC697MDL6nn, 15 discrete output modules, 3 analog input modules, and 2 analog output modules, for a total of 44 I/O modules altogether. The 1974 bytes of configuration data is well within the configurable limit of 4500 bytes.

Description

Number

Multiplyby

=

 

 

of Each

BytesEach

Contribution

 

Numberof I/O Data Types

4

36

144

 

(%I, %AI, %Q, %AQ)

 

 

 

 

Discrete Input Modules, MDL2nn

10

36

360

 

Discrete Input Modules, MDL6nn

14

42

588

 

Discrete Output Modules

15

38

570

 

AnalogInputModules

3

150

450

 

AnalogExpanderModules

0

22

0

 

AnalogOutputModules

2

86

172

 

RemoteI/OScanner

1

50

50

 

 

 

 

 

Total

 

 

 

1974

 

 

 

 

Example 2

A remote drop is planned with 16 analog input modules, 20 analog output modules, 4 discrete input modules with model numbers IC697MDL6nn, and 4 discrete output modules, for a total of 44 I/O modules altogether. This is the same number of modules used in example 1.

This would be an invalid configuration; it would not be accepted by a Remote I/O Scanner. It would be necessary to remove some I/O modules from the remote drop to bring its configuration data below the maximum limit.

Description

Number

Multiplyby

=

 

 

of Each

BytesEach

Contribution

 

Numberof I/O Data Types

4

36

144

 

(%I, %AI, %Q, %AQ)

 

 

 

 

Discrete Input Modules, MDL2nn

0

36

0

 

Discrete Input Modules, MDL6nn

4

42

168

 

Discrete Output Modules

4

38

152

 

AnalogInputModules

16

150

2400

 

AnalogExpanderModules

0

22

0

 

AnalogOutputModules

20

86

1720

 

RemoteI/OScanner

1

50

50

 

 

 

 

 

Total

 

 

 

4634

 

 

 

 

132

Series 90±70 Remote I/O Scanner Use's Manual ± July 1992

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Page 132
Image 132
GE GFK0579B user manual Series 90±70 Remote I/O Scanner Uses Manual ± July
Page 131 Page 133

GFK0579B specifications

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