GE GFK-1004B 사용자 설명서

4-13

GFK-1004B

Chapter 4 Programming Communications Requests

H When the read period is very long (minutes or hours). In this case a shorter timeout

value can be specified so the application doesn’t have to wait for the read period to
expire before taking action.

(Word 13) Local PLC - Memory Type:

Words 13-14 specify the location in the local PLC

where the Ethernet Interface will store data received from the remote PLC. The size of
this area is set by the size of the data read from the remote PLC (Word 17). The user is
responsible for assuring that this area is large enough to contain the requested data
without overwriting other application data. Valid memory types are listed in Table 4-2.

Table 4-2. Series 90-70 PLC Memory Types

ÁÁÁÁ

Type

ÁÁÁÁÁ

Value

(Decimal)

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Description

ÁÁÁÁ

%L*

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Program Block Local register memory (word mode)

ÁÁÁÁ

%P*

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Program register memory (word mode)

ÁÁÁÁ

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

ÁÁÁÁ

%AI

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Analog input memory (word mode)

ÁÁÁÁ

%AQ

ÁÁÁÁÁ

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Analog output memory (word mode)

ÁÁÁÁ

ÁÁÁÁÁ

16
70

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Discrete input memory (byte mode)
Discrete input memory (bit mode)

ÁÁÁÁ

ÁÁÁÁÁ

18
72

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Discrete output memory (byte mode)
Discrete output memory (bit mode)

ÁÁÁÁ

ÁÁÁÁÁ

20
74

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Discrete temporary memory (byte mode)
Discrete temporary memory (bit mode)

ÁÁÁÁ

ÁÁÁÁÁ

22
76

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Discrete momentary internal memory (byte mode)
Discrete momentary internal memory (bit mode)

ÁÁÁÁ

%SA

[

ÁÁÁÁÁ

24
78

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Discrete system memory group A (byte mode)
Discrete system memory group A (bit mode)

ÁÁÁÁ

%SB

[

ÁÁÁÁÁ

26
80

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Discrete system memory group B (byte mode)
Discrete system memory group B (bit mode)

ÁÁÁÁ

%SC

[

ÁÁÁÁÁ

28
82

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Discrete system memory group C (byte mode)
Discrete system memory group C (bit mode)

ÁÁÁÁ

[

ÁÁÁÁÁ

30
84

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Discrete system memory (byte mode)
Discrete system memory (bit mode)

ÁÁÁÁ

ÁÁÁÁÁ

56
86

ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ

Discrete global data table (byte mode)
Discrete global data table (bit mode)

[

Read-only memory, cannot be written to.

Can only be accessed in the Remote PLC.

(Word 14) Local PLC - Memory Starting Address:

Word 14 specifies the starting address in

the local PLC in which the data from the remote PLC is to be stored (1-based).

(Word 15) Remote PLC - Memory Type:

Words 15-16 specify the memory type and

starting address in the remote PLC from which the data is to be read. Valid values for
Word 15 are given in Table 4-2. If %P memory is used, you must specify a Program name
in words 24 - 27. If %L memory is used, you must specify a Program name in words 24 -
27 and a Program Block name in words 28 - 31.

(Word 16) Remote PLC - Memory Starting Address:

Word 16 specifies starting address in

the remote PLC from which the data is to be read (1-based). Valid ranges of values depend
on the remote PLC .

(Word 17) Remote PLC - Number of Memory Units:

Word 17 specifies the number of

bits, bytes or words to be read, determined by the remote PLC memory type specified.
For example, if the memory type is %I in bit mode this is the number of bits. If the