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SLC 500 Fixed I/O

Description

O:0

word 0

O:1

word 1

O/16

bit 16

O:1/0

bit 0 word 1 (same as O/16)

73

Allen-Bradley ControlLogix Ethernet Driver Help

PLC5* O:0 O:37 O/42 O:2/2

Description word 0 word 31 (37 octal = 31 decimal) bit 34 (42 octal = 34 decimal) bit 2 word 2 (same as O/42)

*Addresses are in Octal.

SLC 500 Modular I/O O:1 O:1.0 O:12 O:12.2 O:4.0/0 O:4/0 O:4.2/0 O:4/32

Description word 0 slot 1 word 0 slot 1 (same as O:1) word 0 slot 12 word 2 slot 12 bit 0 word 0 slot 4 bit 0 slot 4 (same as O:4.0/0) bit 0 word 2 slot 4 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.

Syntax

Data Type

Access

I:<word>

Short, Word, BCD

Read/Write

I:<word>/<bit>

Boolean

Read/Write

I/bit

Boolean

Read/Write

PLC-5 Syntax

Note: Word and bit address information is in octal for PLC-5 models. This follows the convention of the

Syntax

Data Type

Access

I:<word>

Short, Word, BCD

Read/Write

I:<word>/<bit>

Boolean

Read/Write

I/bit

Boolean

Read/Write

programming software.

Micrologix Syntax

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

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.

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

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