Product Procurement & Buyer Guide
The 1747-L551 processor from Allen-Bradley delivers robust control for SLC 500 systems. This SLC 5/05 module supports up to 4096 discrete inputs and outputs. It also handles 480 analog I/O points. The user memory holds 16,000 words or 16 KB of battery-backed RAM. Such capacity suits medium to large automation tasks. Engineers can rely on a typical program scan time of 0.9 ms per K. The I/O scan time reaches just 0.225 milliseconds. These speeds enable fast, precise control loops.
Procurement teams will value the built-in Ethernet port. This port supports 10/100 Base-T channels for SNMP, BOOTP, and extended messaging. The RS-232 channel offers DF1 full duplex, half-duplex master, and radio modem protocols. Communication flexibility reduces integration costs. The module also includes a real-time clock and calendar. Such features simplify data logging and time-stamped events.
Step-by-Step Installation Guide
Install the 1747-L551 exclusively in Slot Zero of any SLC 500 chassis. Always disconnect power from the controller before inserting or removing modules. This action prevents damage to the backplane. Mount the processor securely using the chassis latch mechanism. After mounting, connect the required communication cables. Use an Ethernet cable for network connectivity. Attach an RS-232 cable for local programming or peer-to-peer links.
Power up the system and observe the LED indicators. The RUN LED confirms normal operation. A CPU FAULT light signals a hardware or software error. A low battery LED warns when the 1747-BA battery needs replacement. For remote I/O, install a communication adapter in the same chassis. Place scanner modules in remote chassis. Supported protocols include Ethernet, RIO, DH485, and DH+.
Logistics & Standard Packaging Details
Express delivery shipping is available via FedEx, UPS, and DHL.
