Allen-Bradley's 1756-L74 is a ControlLogix 5570 device with 32 events and 100 event triggers for each program and event task. The built-in USB communication port of the 1756-L74 enables it to communicate via EtherNet / IP, ControlNet, DeviceNet, Data Highway Plus ™ and Remote I / O SynchLink ™ software for programming, configuration, firmware update and online editing. ControlLogix 5570 controllers use connections to establish communication links between devices. The integrated motion capabilities of the 1756-L74 include SERCOS interface, analog options, and integrated motion over EtherNet / IP networks. Programming languages are ladder diagrams, structured text, function diagrams, and sequential function diagrams.
The 1756-L74 controller has 16 MB of user memory and 0.98 MB of I / O memory. It has a total of 128,000 digital I / O and 4000 analog I / O. The 1756-L74 controller has compatible energy storage modules, such as 1756-ESMCAP, 1756-ESMCAPK, 1756-ESMNSE, 1756-ESMNSEK, 1756-ESMNRM, and 1756-ESMNRMK modules. The 1756-L74 controller only requires 2.5 W of power consumption and only 8.5 BTU / hour of heat dissipation. The 1756-L74 has the basic insulation type of USB port to the system. Any slot with a 1-slot width in the 1756 series has a chassis-based module location. Possible chassis include 1756-A4, 1756-A4K, 1756-A7, 1756-A7K, 1756-A10, 1756-A10K, 1756-A13, 1756-A13K, 1756-A17, and 1756-A17 K.
The 1756-L74 uses standard power supplies such as 1756-PA50, 1756-PA72, and 1756-PA72K. For power redundancy, the 1756-L74 uses only 1756-PA75R, 1756-PA75RK, 1756-PB75R, 1756-PB75RK, 1756-PSCA2, or 1756-PSCA2K. The 1756-L74 has an open housing, an operating temperature of 0-60 ° C, and a non-operating temperature of -40-85 ° C. At 2 g, the working vibration is 10-500 Hz, the 1756-L74 working shock is 30 g, and the non-working shock is 50 g.
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