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FAQs
Q1: What is the difference between the 1756-L73XT and the standard 1756-L73?
The 1756-L73XT features conformal coating on the circuit board and an extended operating temperature range of -25°C to +70°C, compared to the standard L73's 0°C to +60°C range. This makes the XT version suitable for harsh environments such as oil & gas facilities, mining operations, and outdoor installations without climate-controlled enclosures.
Q2: Does the 1756-L73XT have built-in Ethernet?
No. Like all 1756-L7x series controllers, the L73XT requires a separate communication module (e.g., 1756-EN2T or 1756-EN2TXT) for EtherNet/IP connectivity. It has only a USB programming port built in.
Q3: What is the user memory capacity of this controller?
The 1756-L73XT has 8 MB of user memory for program and data storage. This is sufficient for large, complex applications involving process control, motion, and discrete automation.
Q4: Can the 1756-L73XT be used in safety applications?
The controller itself supports SIL 3 and PLe certifications. However, for dedicated safety functions requiring GuardLogix capabilities, the 1756-L73S (with 4 MB safety memory) is the recommended model. The L73XT is primarily designed for standard control in extreme environments.
Q5: What is the replacement battery for the 1756-L73XT?
The controller uses the 1756-ESMCAPXT Energy Storage Module (ESM) for memory retention. Unlike traditional lithium batteries, the ESM eliminates maintenance and environmental disposal issues associated with lithium batteries.
