1747-L542

Technical specifications

Manufacturer

Allen-Bradley

Manufacturer part no.

1747-L542

Type

SLC 500 processor

Application

PLC controller

Used with

SLC 500 1746 chassis

Processor

SLC 5/04

Memory (words)

32 K

I/O capacity, max

4096 discrete inputs/4096 discrete outputs

Local system, max

3 chassis / 30 slots

Programming instructions

107

Typical scan time

0.9 ms/K (typical for a 1 K ladder logic program)

Bit execution (XIC)

0.37 µs

Programming software

RSLogix 500

Communication options

DH485; RS-232 (DF1 full-duplex, DF1 half-duplex master/slave, DF1 radio modem, DH-485 or ASCII); Data Highway Plus; Ethernet TCP/IP through a 1761-NET-ENI interface; ControlNet through a 1747-KFC15; DeviceNet through a 1761-NET-DNI

Power supply loading at 5V dc

1.0 A

Power supply loading at 24V dc

0 mA (processors made before April 2002 draw 200 mA; check the label)

Program scan hold-up time after loss of power

20 ms...3 s (dependent on power supply loading)

Noise immunity

NEMA Standard ICS 2-230

Vibration

Displacement: 0.015 in., peak-to-peak at 5-57 Hz; Acceleration: 2.5 g at 57...2000 Hz

Shock, operating

30 g

Ambient temperature rating, operating

0...60 °C (32...140 °F)

Ambient temperature rating, storage

-40...85 °C (-40...185 °F)

Humidity

5 to 95% without condensation

Technical documents (1)

• Rockwell Automation publication 1747-IN009 (specifications)

Key features

• 32 K words of program memory
• Up to 4096 discrete inputs and 4096 discrete outputs
• Local system of up to 3 chassis / 30 slots
• Programmed with RSLogix 500 software
• DH485, RS-232 and Data Highway Plus communication options

About the Allen-Bradley 1747-L542

The Allen-Bradley 1747-L542 is the SLC 5/04 32K Controller, and Rockwell lists its lifecycle status as Discontinued. According to Rockwell Automation publication 1747-IN009, it has 32 K words of memory, 107 programming instructions and a maximum I/O capacity of 4096 discrete inputs and 4096 discrete outputs. The same publication gives a typical scan time of 0.9 ms/K for a 1 K ladder logic program and a bit execution time (XIC) of 0.37 µs. It loads the power supply with 1.0 A at 5V dc and 0 mA at 24V dc, although processors made before April 2002 draw 200 mA, so check the label.

What is the 1747-L542 used for?

In an SLC 500 system the 1747-L542 is the processor, running the ladder logic program and handling the I/O of a local system of up to 3 chassis / 30 slots. Rockwell rates it for operation at 0...60 °C and 5 to 95% humidity without condensation, which places it in industrial control panels.

Lifecycle and successor

Discontinued.

Before you order

What to photograph or confirm so the right unit is quoted.

Check that the catalog number on the module label reads 1747-L542, and note the series letter and firmware revision printed on the same label. Send us a photo of the label if you need help confirming the part.