The Siemens SIMATIC ET 200SP HA BU-SEND BASE BA-SEND (6DL1135-6TB00-0HX1) is a specialized Base Unit (mechanical carrier) for the ET 200SP High Availability distributed I/O system. It provides the electrical bridge for potential groups and incorporates SEND clock cycle synchronization functionality. This Base Unit is critical for achieving true high availability, as it enables hot-swapping of I/O modules without interrupting communication to the partner CPU/IO-Controller in redundant configurations. The BU-SEND ensures seamless module replacement under load, a key requirement for process industries where maintenance must not cause downtime. Used in oil & gas, chemical, and power generation plants with S7-410 redundant controllers.
Q: What is the main purpose of this Base Unit?
A: It enables hot-swapping of I/O modules without interrupting communication in redundant HA configurations.
Q: What does SEND functionality mean?
A: It supports SEND clock cycle synchronization, ensuring seamless data transfer during module replacement under load.
Q: Can I use standard Base Units instead?
A: No. Standard Base Units do not support the hot-swap and SEND features required for HA redundancy.
Q: What wiring types are available?
A: Screw-type or push-in (spring-cage) terminals, depending on the specific variant.
Q: Is this an I/O module?
A: No. It is a Base Unit (mechanical carrier) that the I/O module plugs into
FAQ
.
