Omron C200H-LK401 Network Card User Manual


 
63
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.
Unit 0 (C2000H PC)
1100 11111100 1110
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.
Units 1 and 2 (C500 PC)
1100 11110000 0001
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.
Units 3 and 5 (C200H PC)
1100 11110000 0001
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.
System Configuration
Note
Break at Point A
Error Examples Section 7-2