29: T
ROUBLESHOOTING
29-22
« FC4A M
ICRO
S
MART
U
SER
’
S
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ANUAL
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Restriction on Ladder Programming
Due to the structure of
WindLDR
, the following ladder diagram cannot be programmed — a closed circuit block is formed
by vertical lines, except for right and left power rails, and the closed circuit block contains one or more prohibited instruc-
tions shown in the table below.
The error detection depends on the version of
WindLDR
. When using
WindLDR
ver. 4.4 or earlier, particular care is needed.
Modifying Prohibited Ladder Programs
Intended operation can be performed by modifying the prohibited ladder program as shown in the examples below:
Prohibited Instructions
OUT, OUTN, SET, RST, TML, TIM, TMH, TMS, CNT, CDP, CUD, SFR, SFRN, SOTU, SOTD
Error
Detection
WindLDR
Ver. 4.4 or earlier
The ladder program is conver ted to incorrect mnemonics, without showing an error
message. The program can be downloaded to the CPU module, causing an unexpected
operation and possible danger.
WindLDR
Ver. 4.5 or later
When conver ting the ladder program, an error message is shown, such as “TIM fol-
lows an invalid operand.” Conversion fails to create mnemonics and the program is
not downloaded to the CPU module.
Caution
•
When using
WindLDR
ver. 4.4 or earlier, the restriction on ladder programming may cause an
unexpected operation and possible danger.
•
WindLDR
ver. 4.5 or later prevents conversion of prohibited ladder program, making sure of safety.
Prohibited
Instruction
Relay 1
Program
Relay 2
Closed Circuit Block
Ver tical
Line A
Ver tical
Line B
Program
Left Power Rail
Right Power Rail
M0
Prohibited Ladder Program 1
TIM
100
T0
Q0
M1
M2
M0
Modified Ladder Program 1
TIM
100
T0
M1
T0
M0
Q0
M2
M0
Prohibited Ladder Program 2
TIM
100
T0
Q0
M1
M2
M0
Modified Ladder Program 2
TIM
100
T0
M1
T0
Q0
TIM
50
T1
TIM
50
T1
M2
T1
Summary of Contents for FC4A-C10R2
Page 1: ...FC4A SERIES Micro Programmable Logic Controller User s Manual FC9Y B812 ...
Page 6: ...PREFACE 4 FC4A MICROSMART USER S MANUAL ...
Page 94: ...2 MODULE SPECIFICATIONS 2 74 FC4A MICROSMART USER S MANUAL ...
Page 184: ...6 ALLOCATION NUMBERS 6 20 FC4A MICROSMART USER S MANUAL ...
Page 218: ...8 ADVANCED INSTRUCTIONS 8 8 FC4A MICROSMART USER S MANUAL ...
Page 240: ...11 BINARY ARITHMETIC INSTRUCTIONS 11 8 FC4A MICROSMART USER S MANUAL ...
Page 244: ...12 BOOLEAN COMPUTATION INSTRUCTIONS 12 4 FC4A MICROSMART USER S MANUAL ...
Page 252: ...13 SHIFT ROTATE INSTRUCTIONS 13 8 FC4A MICROSMART USER S MANUAL ...
Page 274: ...15 WEEK PROGRAMMER INSTRUCTIONS 15 8 FC4A MICROSMART USER S MANUAL ...
Page 378: ...22 DUAL TEACHING TIMER INSTRUCTIONS 22 4 FC4A MICROSMART USER S MANUAL ...
Page 386: ...23 INTELLIGENT MODULE ACCESS INSTRUCTIONS 23 8 FC4A MICROSMART USER S MANUAL ...
Page 408: ...24 ANALOG I O CONTROL 24 22 FC4A MICROSMART USER S MANUAL ...
Page 426: ...26 COMPUTER LINK COMMUNICATION 26 6 FC4A MICROSMART USER S MANUAL ...