中文版
Description
The 1747-L542 SLC is an SLC 5/03 controller. This controller is one of the Three (3) controllers under
the 1747-L52 SLC 5/03 category. This controller is the mid-range controller of SLC 5/03 which has 32 KB user memory while still capable of handling 4096 Input and outputs.
The 1747-L542 is used with the modular style hardware. This processor is installed to slot Zero (0) of any
SLC chassis such as 1746-A2, 1746-A7, 1746-A10 and 1746-A13. It is powered though the power supplied in the backplane, provided by the system power supply installed at the leftmost area of the chassis.
This SLC processor has integrated RS232 and Data Highway Plus (DH+) communication port which allows this
processor to be communicated with computer-based control systems such as Human Machine Interface (HMI) or
Supervisory Control and Data Acquisition (SCADA). This processor may also be used for messaging or implement pass-through
communication for other Allen-Bradley Programable Logic Controller (PLC) such as PLC 5, CompactLogix and ControlLogix platforms.
1756-L542
This processor is built with status indicators such as Run, CPU Fault, Forced I/O, Battery Low,
RS-232 and DH+ LEDs. It is also provided with a key for switching the processor’s operating mode.
The Allen-Bradley 1747-L542 is an SLC 500 SLC 5/04 modular processing unit that has the capacity to
handle 32K words, specifically 4K data storage and 28K words for program data. It has an absolute maximum of 4096
discrete inputs and 4096 discrete outputs, with 480 maximum local analog I/O. The 1747-L542 also has a maximum of
3 local I/O chassis, with a maximum of 30 slots in the local I/O chassis. Its I/O scan time is 0.255 milliseconds, typical program
scan time is 0.9 milliseconds/Kword, and bit execution time is 0.37 milliseconds, with a program scan holdup time of 20 milliseconds to 3 seconds after a power loss.
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