The 6ES7194-2MH20-0AC0 is a 2-meter shielded PROFINET bus cable with a straight M8 plug on one end and open pigtail wires on the other—sized for field termination within the same enclosure. When your bus topology transitions from an ET 200AL module to a terminal block or patch panel inside the cabinet, 2 meters is the clean length. Green PUR jacket, dual-shield construction, 4-pole M8.

When does 2 meters of open-end bus cable beat the 5-meter version?

Two meters covers in-enclosure field termination—from an ET 200AL module bus port to a terminal strip on the same mounting plate. At 2 meters, you have enough slack for clean routing around wire duct without coiling excess cable. The 5-meter open-end variant (6ES7194-2MH50-0AC0) is the right call when the terminal block is in a separate enclosure or across the room.

How do I maintain shield integrity at the open end?

The cable's dual shield—aluminum-clad foil plus tinned-copper braid—must be terminated at the field end. Separate the braid from the signal conductors, twist it into a single drain lead, and land on the functional-earth (FE) terminal at your termination point. Keep the unshielded conductor length as short as possible—under 50mm from jacket cut to terminal—to minimize radiated emissions and immunity degradation. An unterminated shield turns the cable into a noise antenna on your PROFINET segment.

Frequently Asked Questions

Can I shorten this cable if 2 meters is too long?

Yes. Cut from the open end, re-strip the PUR jacket, dress the shield and signal conductors, and re-terminate. Maintain the 50mm maximum unshielded length after the jacket cut. The pre-terminated M8 plug end is molded and cannot be field-modified.

What wire gauge are the signal conductors?

The twisted pairs are 0.5/1.0mm—0.5mm² conductor cross-section with 1.0mm insulation OD. PE (polyethylene) core insulation provides the controlled dielectric needed for 100-ohm differential impedance at 100 Mbit/s PROFINET signaling.