Restriction On Ladder Programming - IDEC MICROSmart FC6A Series Ladder Programming Manual

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 instructions shown
in the table below.
Left Power Rail
Prohibited Instructions
Error Detection
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
Program
Relay 1
Vertical
Line A
Relay 2
OUT, OUTN, SET, RST, TML, TIM, TMH, TMS, TMLO, TIMO, TMHO, TMSO, CNT, CDP, CUD, CNTD, CDPD,
CUDD, SFR, SFRN, SOTU, SOTD
When converting the ladder program, an error message is shown, such as "TIM follows an invalid device."
Conversion fails to create mnemonics and the program is not downloaded to the FC6A Series MICROSmart.
T0
Q0
T0
Q0
T1
FC6A S MICROS
ERIES MART
Prohibited
Instruction
Closed Circuit Block
Modified Ladder Program 1
Modified Ladder Program 2
L P M
ADDER ROGRAMMING ANUAL
4: B
ASIC
Right Power Rail
Program
Vertical
Line B
TIM
100
M0 M1
M0 T0
M2
TIM
100
M0 M1
TIM
50
M2
T0
T1
FC9Y-B1726
I
NSTRUCTIONS
T0
Q0
T0
T1
Q0
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