Functionality Differences Among Models

Not all Modicon programmable logic controllers behave/support the same function codes.  The following table illustrates the differences:

Function Type	Function Code	184/384	484	584	984	Quantum	VersaPoint ENIU	VersaMax ENIU
Read Coil Status	1	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Read Input Status	2	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Read Holding Reg.	3	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Read Input Reg.	4	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Force Single Coil.	5	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Force Single Hold Reg.	6	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Force Multiple Coil Reg.	15	Yes	No	Yes	Yes	Yes	No	No
Force Multiple Holding Reg.	16	Yes	No	Yes	Yes	Yes	Yes	Yes
Program General Reg.	13	Yes	No	Yes	Yes	Yes	No	No
Poll General Reg.	14	Yes	No	Yes	Yes	Yes	No	No