55
Programming Restrictions
Section 2-4
Error-related
Restrictions
If a fatal error occurs in the CPU Unit while a function block definition is being
executed, ladder program execution will stop at the point where the error
occurred.
In this case, the MOV AAA BBB instruction will not be executed and output
variable D200 will retain the same value that it had before the function block
was executed.
Prohibiting Access to
FB Instance Areas
To use a function block, the system requires memory areas to store the
instance’s internal variables, input variables, output variables, and input-out-
put variables.
CJ2-series CPU Units
Note Force-setting/resetting is enabled when the following EM banks are specified:
CS/CJ-series CPU Units Ver. 3.0 or Later, and NSJ Controllers
FQM1 Flexible Motion Controllers
FB
EN ENO
AAA BBB
D200D100
0.0
LD P_On
++ AAA
MOV AAA BBB
10.0
Program FB definition
BodyInstance name
Fatal error occurs here.
Function block instance
area
Initial value of
start address
Initial value
of size
Allowed data areas
Non-retained H512 896 CIO, WR, HR, DM,
EM (See note.)
Retained H1408 128 HR, DM, EM (See
note.)
Timer T3072 1024 TIM
Counter C3072 1024 CNT
CJ2H-CPU64(-EIP)/-CPU65(-EIP) EM bank 3
CJ2H-CPU66(-EIP) EM banks 6 to 9
CJ2H-CPU67(-EIP) EM banks 7 to E
CJ2H-CPU68(-EIP) EM banks 11 to 18
Function block instance
area
Initial value of
start address
Initial value
of size
Allowed data areas
Non-retained H512 896 CIO, WR, HR, DM, EM
Retained H1408 128 HR, DM, EM
Timer T3072 1,024 TIM
Counter C3072 1,024 CNT
FB Instance
Area
Default value Applicable memory
areas
Start address End address Size
Non Retain 5000 5999 1000 CIO, WR, DM
Retain None
Timers T206 T255 50 TIM
Counters C206 C255 50 CNT
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