Restriction On Ladder Programming - IDEC FC4A-C10R2 User Manual

29: T
ROUBLESHOOTING

Restriction on Ladder Programming

• When using
Caution
unexpected operation and possible danger.
•
WindLDR
Due to the structure of
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.
Left Power Rail
The error detection depends on the version of
Prohibited Instructions
WindLDR
Ver. 4.4 or earlier
Error
Detection
WindLDR
Ver. 4.5 or later
Modifying Prohibited Ladder Programs
Intended operation can be performed by modifying the prohibited ladder program as shown in the examples below:
Prohibited Ladder Program 1
TIM
100
M0 M1
M2
Prohibited Ladder Program 2
TIM
100
M0 M1
TIM
50
M2
29-22
ver. 4.4 or earlier, the restriction on ladder programming may cause an
WindLDR
ver. 4.5 or later prevents conversion of prohibited ladder program, making sure of safety.
, the following ladder diagram cannot be programmed — a closed circuit block is formed
WindLDR
Program
Vertical
Line A
WindLDR
OUT, OUTN, SET, RST, TML, TIM, TMH, TMS, CNT, CDP, CUD, SFR, SFRN, SOTU, SOTD
The ladder program is converted to incorrect mnemonics, without showing an error
message. The program can be downloaded to the CPU module, causing an unexpected
operation and possible danger.
When converting 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.
T0
Q0
T0
Q0
T1
« FC4A M
Prohibited
Instruction
Relay 1
Relay 2
Closed Circuit Block
. When using
WindLDR
S U ' M
ICRO MART SER S ANUAL
Right Power Rail
Program
Vertical
Line B
ver. 4.4 or earlier, particular care is needed.
Modified Ladder Program 1
TIM
100
M0 M1
M0 T0
M2
Modified Ladder Program 2
TIM
100
M0 M1
TIM
50
M2
T0
T1
»
T0
Q0
T0
T1
Q0