Specifications

Allen-Bradley ControlLogix Ethernet Driver Help
Counter Files
Control Files
Integer Files
Float Files
ASCII Files
String Files
BCD Files
Long Files
MicroLogix PID Files
PID Files
MicroLogix Message Files
Message Files
Block Transfer Files
Function File Listing
High-Speed Counter File (HSC)
Real-Time Clock File (RTC)
Channel 0 Communication Status File (CS0)
Channel 1 Communication Status File (CS1)
I/O Module Status File (IOS)
Note: For more information on device models and their supported files, refer to Address Descriptions.
Output Files
The syntax for accessing data in the output file differs depending on the PLC model. Arrays are not supported for
output files. The default data types are shown in bold.
PLC-5 Syntax
Syntax Data Type Access
O:<word> Short, Word, BCD Read/Write
O:<word>/<bit> Boolean Read/Write
O/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
O:<word> Short, Word, BCD Read/Write
O:<word>/<bit> Boolean Read/Write
O/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 users consult both the
MicroLogix documentation and the controller project to determine the module's true word size.
MicroLogix Embedded I/O Word Sizes
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