Omron C200H-LK401 User Manual

This example will describe error indications on all PC Link Units using the
following System configuration. Transmission line breaks will be described at
two different points, A and B. Unit 3 has been set for double allocation, and
thus is allocated the LR bits and flags from both Unit 3 and Unit 4.

C2000H PC

Unit 0,

(polling unit)

C200H PC

Unit 3

C500 PC

Unit 1

C500 PC

Unit 2

(B)

(A)

C200H PC

Unit 5

Double allocation

The C200H could be replaced by the C200HS and C200HX/HG/HE(-Z) with-
out any changes in this example.

Because Unit 0 receives no response from Units 1, 2, 3, and 5 it indicates an
error for all of them. Because Units 1, 2, 3, and 5 receive no polling signal
from Unit 0, they each indicate an error for it. LED indications are shown be-
low, as well as the conditions of the PC RUN and Error Flags in the SR area.

1

1

0

0

1

1

1

1

1

1

0

0

1

1

1

0

Bit 15

Bit 0

Word 250

Error Flags ON
for Units 1 to 5

Error Flag OFF
for Unit 0

PCs operative
for all Units

Display pattern A

Display pattern B

Allocated to Unit 3.

1

1

0

0

1

1

1

1

0

0

0

0

0

0

0

1

Bit 15

Bit 0

Word 62

Error Flags OFF for
Units 1 to 5

Error Flag ON for
Unit 0

PCs operative
for all Units

Display pattern A

Display pattern B

Allocated to Unit 3.

1

1

0

0

1

1

1

1

0

0

0

0

0

0

0

1

Bit 15

Bit 0

Word 250

Error Flags OFF
for Units 1 to 5.

Error Flag ON for
Unit 0.

PCs operative
for all Units.

Allocated to Unit 3.