Configured for impedance matching and signal reflection suppression in Modbus Plus peer-to-peer networks, the Schneider Electric AS-MBKT-185 (MBKT-185 Line Terminator) provides direct physical termination at junction box interfaces.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | AS-MBKT-185 |
| Brand | Schneider Electric |
| Origin | Webster, NY, USA |
| Weight | 0.06 lb (0.03 kg) |
| Dimensions | 3.74 in x 2.76 in x 0.67 in |
| Operating Temp | 0 to 60 deg C (Standard Industrial) |
| Power Consumption | Passive Component (No External Power Required) |
| IP Rating | IP20 |
| Quantity per Set | 2 |
Backplane Bus and Network Firmware Compatibility
The AS-MBKT-185 ensures signal integrity across the Modicon Momentum, Premium, and Quantum automation platforms. Proper termination is mandatory to prevent data collision caused by signal reflections on unterminated stubs or trunk lines. The component maintains electrical compatibility with the 990NAD23000 junction box assemblies, ensuring that the backplane bus communication velocity is not degraded by impedance mismatches. Firmware revisions in the associated PLC processors do not affect the passive electrical characteristics of this terminator.
Frequently Asked Questions
Q: Is the AS-MBKT-185 required at every node in a Modbus Plus network?
A: No. Terminators are only required at the two physical ends of the main trunk cable. Intermediate drops using tap cables to junction boxes must remain unterminated.
Q: Can this terminator be used with third-party Modbus Plus compatible devices?
A: Yes, provided the device utilizes standard 990NAD23000 series junction boxes or compatible RJ45/DB9 interfaces operating within the Modbus Plus electrical specification.
Field Installation Guidelines
Install the AS-MBKT-185 directly into the RJ45 port of the 990NAD23000 junction box located at each end of the network segment. Ensure the locking tab engages fully to maintain connection integrity. Do not install terminators on tap cables connected to drop devices. Verify that the Modbus Plus network is de-energized prior to inserting or removing the terminator to prevent transient voltage spikes.
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