Omron CQM1H-CLK21 User Manual

Page 181

158

Checking Data Link Status

Section 5-4

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

The following shows an example of a remaining receive area.

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)

Note

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

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

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.

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.

Send
area

Receive
area

Data indicated by

Send
area

Receive
area

Data indicated by

Sufficient

is received in
node 2.

Insufficient (short)

Data indicated by

cannot be received in node 2.

and the remaining data is truncated.

is received

Node 1

Node 2

Node 1

Node 2

Data indicated by

Send
area

Receive
area

Send
area

Receive
area

Data indicated by

No remaining

is received in
node 2.

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

Remaining

Node 1

Node 2

Node 1

Node 2

PLC status
0: Inactive (user program

not running)

1: Active (user program

running)

Communications error
(data link reception)
0: Normal
1: Error

PLC's CPU Unit error
0: Normal
1: Error

Data link participation
0: Not in data link or data link inactive
1: In data link

Node 4

Node 8

First status word + 0
First status word + 1

First status word + 2

First status word + 3
First status word + 4

First status word + 5
First status word + 6

First status word + 7

First status word + 8

First status word + 9

First status word + 10

First status word + 11
First status word + 12

First status word + 13
First status word + 14

First status word + 15

Node 12

Node 16

Node 20

Node 24

Node 30

Node 32

Node 36

Node 40

Node 44

Node 48

Node 52

Node 58

Node 60

Node 3

Node 7

Node 11

Node 15

Node 19

Node 23

Node 27

Node 31

Node 35

Node 39

Node 43

Node 47

Node 51

Node 55

Node 59

Node 2

Node 6

Node 10

Node 14

Node 18

Node 22

Node 26

Node 30

Node 34

Node 38

Node 42

Node 46

Node 50

Node 54

Node 58

Node 62

Node 1

Node 5

Node 9

Node 13

Node 17

Node 21

Node 25

Node 29

Node 33

Node 37

Node 41

Node 45

Node 49

Node 53

Node 57

Node 61

This manual is related to the following products:

CS1W-RPT01 CS1W-CLK21-V1 C200HW-CLK21 CVM1-CLK21 CJ1W-CLK21-V1