Publication 1756-RM084F-EN-P - July 2002
Creating a Complete Import/Export File 3-3
For example, create a user-defined datatype called “MyBits” and a tag
called “MyTag” of type “MyBits.”
ZZZZZZZZZZMyBits0 is the host member of MyBit0 and MyBit1. The
datatype syntax for this example is:
DATATYPE MyBits (FamilyType := NoFamily)
SINT ZZZZZZZZZZMyBits0 (Hidden := 1);
BIT MyBit0 ZZZZZZZZZZMyBits0 : 0 (Radix := Binary);
BIT MyBit1 ZZZZZZZZZZMyBits0 : 1 (Radix := Binary;
END_DATATYPE
The host member is normally a hidden member because only the bit
references are visible when you define a tag of the datatype.
Bit members cannot be defined before their host members. Note that
BitPosition zero is the least significant bit.
User-defined datatype “MyBits”
Tag “MyTag” of type “MyBits”
IMPORTANT
There must be a space between the host member
name and the colon and the colon and the bit
position because type names can contain a colon
(for example, I/O structures) and without the space
we could not tell where type name actually ends.
Spare Allen-Bradley Parts
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