Siemens 6ES7960-1AA04-0XA0 S7-400H FH Sync Submodule

Siemens 6ES7960-1AA04-0XA0 is a SIMATIC S7-400H synchronization submodule (Sync Submodule) for S7-400H/FH systems, configured as a V4 module that links CPU modules with fiber-optic patch cables up to 10 meters in length. The compact unit measures 13 × 14 × 58 mm and weighs about 0.014 kg, drawing 3.3 V from the CPU with a typical current of 220 mA and a power loss around 0.77 W. It uses an optical interface at 850 nm and supports maximum fiber-coptic cable attenuation of 7.5 dB, with a maximum allowable difference in cable lengths of 9 meters between connected links and a maximum inter-CPU cable length of 10 meters. This submodule is specified for use with S7-400H FH CPUs, including firmware versions V4.0 and V4.5. In practice, it enables precise time and event synchronization across H-family CPUs in high-availability configurations, leveraging a patch-cable-based fiber link to maintain coordinated operation between synchronized processing units within a chassis or between connected CPUs.