The 1771-HS1 module is a servo controller module manufactured by / Automation as part of the PLC-5 series that works with the IMC 120 Series motion controllers. This module comes with 32 KB of memory in its 1771-HM memory cartridge, an encoder module, an 1771-PS7 power supply module, and a maximum of 3 servo controller modules on the I/O chassis. The memory cartridge is connected to the controller module to provide storage for the entire controller module. The 1771-HS1 memory cartridge features a lithium battery for backup with a 3.6 Volts rating and a CMOS Random Access Memory (RAM) with a capacity of 32 KB for the MML program memory. Other notable features of this module include 4 red and green LED light indicators on the front panel along with a power connector for connecting the 1771-PS7 power supply module.

The 1771-HS1 module comes with a power supply module rated at 120 Volts AC voltage at 1 Amp of current and at 220 Volts AC voltage at 2 Amps of current. It also uses the 1771-CAS connector cable to link the power supply to the power connector. Other features of this module include a 50-pin Axis E-stop I/O connector for receiving the encoder feedback signals, E-stop starting signals, E-stop status, and resolver feedback signals. Additionally, this connector provides fast I/O power. The 1771-HS1 module features a 15-pin AUX FDBK connector for receiving the auxiliary encoder feedback signals as well as an encoder. It also provides the encoder with power and it has an RS-232 connector on the front to allow for downloading and uploading the MML programs and AMP parameters.