The 6ES7194-2LH50-1AC0 is a 5-meter 24VDC power cable for the SIMATIC ET 200AL distributed I/O system. One end carries a straight 4-pin M8 socket (female); the other end is an open unterminated pigtail. This is the power field-termination cable—the socket receives the upstream power chain from the previous module or power feed, and the open end lands on a terminal block, DC distribution strip, or power supply output inside the control cabinet.

When should I choose the 5-meter power field-termination cable?

The socket-to-open-end topology has one job: end a power chain at a hardwired termination. Use this cable when the last module in your ET 200AL power segment needs to connect to a terminal block rather than another M8 device. The 5-meter length (2LH50) is sized for within-cabinet field wiring—the terminal block sits in the same enclosure or directly adjacent. If your power chain ends farther away, Siemens offers 10-meter (2LN10-1AC0) and 15-meter (2LN15-1AC0) variants in the same socket-to-open-end configuration.

How does the power cable differ from the bus cable?

Three differences matter at installation time. Shielding: power cables are unshielded—4 Li9Y 0.50mm² conductors inside a PVC/PP jacket—because 24VDC does not need the dual-shield construction that PROFINET signals require. Jacket color: power cables are gray; bus cables are green. This is a safety-critical color code—plugging a gray cable into a bus port sends 24V into the PROFINET ASIC and destroys the interface. Connector gender: power cables use a socket (female) at the upstream end to receive power from a module output or feed port; bus daisy-chain cables use plugs (male) at both ends.

How do I terminate the open end?

The open end exposes four conductors: brown (L+, 24VDC), white (L+, 24VDC), blue (M, 0V), and black (M, 0V). The two L+ and two M conductors are paralleled inside the M8 socket for current sharing—land all four on the corresponding terminals at your power distribution block. Strip length is approximately 30mm per conductor. No shield to dress, no drain wire—just strip, ferrule, and land.