嵌套实例不能和定义的函数块类型相同，因为这会导致无穷的回归定义。任意–级的嵌套实例也不能和其父块类型相同。例如，如果Valve函数块有–个”Motor*类型子块,那麼函数块Motor不能有Valve类型的内部变量n一个一维数组布尔型的内部变量可以是保持型的(缺省值)，也可以是非保持型的。其他类型的变量必须是保持型的。
Siemens 6ES 5951-7LD12 Power Supply Module #23410
Marposs E3 Micro Probe Amplifier #23102
Toshiba Brushless Servo Drive RAD02-1003 Driver #18181
Barber Colman 80EB-10004-002-V-00 Maco 8000 #7379
Texas Instruments 500-5038 Interface Module #23926
Fanuc Servo Amplifier A06B-6060-H223 #10981
ABB System Board 3HAB2211-1 DSQC256A #29408
STI Light Curtain Transmitter MS4332BX #34697
Barber Colman 80EB-1000-002-0-00 MACO 8000 #5533
Square D Circuit Breaker MAL36700, 700 Amp #30123
Square D Circuit Breaker MAL36700 700 Amp #16004
Nachi Teach Pendant ROP301 AR Controller #2233
Allen Bradley Operator Interface 2711-KCI, #11744
Barber Colman A-13447-2 Flat Panel Display #20674
Reliance Controller Board 0-51445 A #23118
Westinghouse Motor Starter A200M4CAC #16014
Nippon Denso 410100-0450 Teach Pendant TP3 #10406
Adept Tech 10332-11000 Teach Pendant #7057
Muegge CPU Board MW-LSCE3327-6K-006 #23203
