Checking Data Link Status

Section 5-4

 

5.

The following shows an example of an insufficient (short) receive area.

Sufficient

 

 

 

Insufficient (short)

Node 2

Node 1

 

Node 2

 

Node 1

 

Receive

Send

Receive

Send

 

 

 

 

area

area

 

 

area

area

 

 

 

 

 

 

 

Data indicated by

 

Data indicated by

 

cannot be received in node 2.

 

is received in

 

 

Data indicated by

is received

 

node 2.

 

 

and the remaining data is truncated.

6. The following shows an example of a remaining receive area.

No remaining

 

Node 1

Node 2

Send

Receive

area

area

 

Data indicated by

 

is received in

 

node 2.

Remaining

Send Node 1Node 2 Receive

area area

Data indicated by

is received in node 2 and the remaining words are cleared.

When 4-bit Format is Specified (i.e., when using a CS/CJ-series PLC with the data link status storage format specification in the DM Parameter Area set to 4-bit format)

First status word + 0

Node 4

Node 3

Node 2

Node 1

First status word + 1

Node 8

Node 7

Node 6

Node 5

First status word + 2

Node 12

Node 11

Node 10

Node 9

First status word + 3

Node 16

Node 15

Node 14

Node 13

First status word + 4

Node 20

Node 19

Node 18

Node 17

First status word + 5

Node 24

Node 23

Node 22

Node 21

First status word + 6

Node 30

Node 27

Node 26

Node 25

First status word + 7

Node 32

Node 31

Node 30

Node 29

First status word + 8

Node 36

Node 35

Node 34

Node 33

First status word + 9

Node 40

Node 39

Node 38

Node 37

First status word + 10

Node 44

Node 43

Node 42

Node 41

First status word + 11

Node 48

Node 47

Node 46

Node 45

First status word + 12

Node 52

Node 51

Node 50

Node 49

First status word + 13

Node 58

Node 55

Node 54

Node 53

First status word + 14

Node 60

Node 59

Node 58

Node 57

First status word + 15

0

0

Node 62

Node 61

PLC status

0:Inactive (user program not running)

1:Active (user program running)

PLC's CPU Unit error

0:Normal

1:Error

Communications error (data link reception)

0:Normal

1:Error

Data link participation

0:Not in data link or data link inactive

1:In data link

Note 1. A communications error will occur in a node that is not participating in the network.

2.When a communications error occurs, previous status is retained for other nodes status.

3.Only the PLC status and the PLC’s CPU Unit error status are refreshed for nodes that are participating in the network, but not participating in the data links.

4.When the data link status area is set in the IR, CIO, or LR Area, the data link status will be instantaneously set to 0 when the mode of the PLC’s CPU Unit is changed.

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Page 180 Page 182
Page 181
Image 181
Omron CS1W-RPT01, CVM1-CLK21, CJ1W-CLK21-V1, C200HW-CLK21, CQM1H-CLK21 Following shows an example of a remaining receive area
Page 180 Page 182
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