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The 6ES5777-1BC01 functions as a bus terminal for the Siemens SIMATIC S5 PLC system. This device terminates the ends of the SINEC L1 fieldbus network. It prevents signal reflections that cause data corruption on long cable runs. Therefore, this bus terminal ensures reliable communication in distributed I/O networks.
Technical Specifications
We engineered this bus terminal for industrial fieldbus termination applications. Its compact design mounts directly onto the Profibus or SINEC L1 connector. Moreover, the unit provides the correct impedance match for the twisted-pair cable.
| Parameter | Specification |
|---|---|
| Dimensions (W x H x D) | 2.0 x 1.6 x 1.0 inches (51 x 41 x 25 mm) |
| Weight | 0.04 kg (0.09 lbs) |
| Resistance Value | 220 ohms ±5% |
| Power Rating | 0.5 watt |
| Temperature Coefficient | ±100 ppm/°C |
| Connection Type | Screw terminal block with two positions |
| Housing Material | Molded thermoplastic (UL94-V0) |
| Wire Range | 24-12 AWG |
| Operating Temperature | -25°C to +70°C (-13°F to 158°F) |
Electrical Characteristics
The 6ES5777-1BC01 provides a precise 220 ohm termination for SINEC L1 bus cables. This resistance matches the characteristic impedance of the twisted shielded pair. The unit dissipates minimal power under normal bus operating conditions. Consequently, it does not generate significant heat or require any cooling.
Installation Locations
Place this bus terminal at each physical end of the SINEC L1 bus segment. The master station typically requires one terminator at its network connection. The farthest slave device on the segment needs the second terminator. Therefore, a simple daisy-chain network uses exactly two terminators total.
Network Performance Impact
The 6ES5777-1BC01 eliminates signal echoes that cause data corruption. Without proper termination, long cable runs produce standing waves and reflections. These reflections create communication errors and intermittent device dropouts. Hence, this terminator directly improves network reliability and data integrity.
Mechanical Design and Mounting
This bus terminal features a compact molded housing for durability. Two screw terminals accept standard field wiring from 24 to 12 AWG. The unit mounts directly onto the bus connector’s terminal strip. No additional hardware or tools are necessary for installation.
Energy Storage and Power Handling
The 6ES5777-1BC01 contains no battery or energy storage components whatsoever. It operates as a purely passive electrical device on the network. The resistor dissipates only the energy from the bus communication signals. Thus, it has no active components that can fail over time.
Compatibility and Applications
This bus terminal works with all SINEC L1 fieldbus networks. It supports both the S5-115U and S5-135U system families. The terminator also works with third-party devices using 220 ohm termination. Hence, you can use this module for both Siemens and non-Siemens bus installations.
Installation Guidance
Mount the 6ES5777-1BC01 onto the terminal strip of the first bus device. Connect one wire to the A terminal of the bus connection. Connect the second wire to the B terminal of the same bus port. Tighten the screws to 0.6 Nm of torque for reliable contact. Install only two terminators per bus segment for proper operation. Remove terminators from intermediate devices on the same cable run.