Specifications

Allen-Bradley ControlLogix Ethernet Driver Help
O:4.0/0 bit 0 word 0 slot 4
O:4/0 bit 0 slot 4 (same as O:4.0/0)
O:4.2/0 bit 0 word 2 slot 4
O:4/32 bit 32 slot 4 (same as O:4.2/0)
Input Files
The syntax for accessing data in the input file differs depending on the PLC model. Arrays are not supported for
input files. The default data types are shown in bold.
PLC-5 Syntax
Syntax Data Type Access
I:<word> Short, Word, BCD Read/Write
I:<word>/<bit> Boolean Read/Write
I/bit Boolean Read/Write
Note: Word and bit address information is in octal for PLC-5 models. This follows the convention of the
programming software.
MicroLogix Syntax
Syntax Data Type Access
I:<word> Short, Word, BCD Read/Write
I:<word>/<bit> Boolean Read/Write
I/bit Boolean Read/Write
MicroLogix models have two types of I/O: embedded I/O and expansion I/O (not applicable for MicroLogix 1000).
Embedded I/O resides with the CPU base unit while Expansion I/O plugs into the CPU base unit. The table below
lists the I/O capabilities of each MicroLogix model.
MicroLogix Model Embedded I/O Expansion I/O
1000 Slot 0 N/A
1100 Slot 0 Slots 1-4
1200 Slot 0 Slots 1-6
1400 Slot 0 Slots 1-7
1500 Slot 0 Slots 1-16
The address syntax for MicroLogix I/O references a zero-based word offset, not a slot. Users must determine the
word offset to a particular slot. This requires knowledge of the modules and their respective size in words. The
table below specifies the size of some available modules; however, it is recommended that the MicroLogix
documentation and controller project be consulted to determine a module's true word size.
MicroLogix Embedded I/O Word Sizes
MicroLogix Model # Input Words # Output Words
1000 2 1
1100 6 4
1200 4 4
1400 8 6
1500 4 4
MicroLogix Expansion I/O Word Sizes
Modules # Input Words # Output Words
1769-HSC 35 34
1769-IA8I 1 0
1769-IA16 1 0
1769-IF4 6 0
1769-IF4XOF2 8 2
1769-IF8 12 1
1769-IM12 1 0
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