The Allen‑Bradley 1746‑A7 SLC 500 control system chassis is a seven‑slot modular backplane rack designed to hold SLC‑500 processors, I/O modules, and communication adapters. It is commonly paired with the 1746‑P3 power supply to provide backplane power for a compact SLC‑500 rack configuration. Dimensions (H x W x D) are 171 mm x 177 mm x 145 mm, with operating temperature from 0 to 60°C, storage temperature from −40 to 85°C, and relative humidity up to 95% RH. This chassis serves legacy automation setups that require a 7‑slot SLC‑500 rack to organize and power processors and I/O modules in a compact, panel‑mountable form.
