Allen-Bradley 871TM-M**NP12 Series, Руководство пользователя, Страница: 9 / 90

Rockwell Automation Publication 871TM-UM002C-EN-P - October 2017 9
Chapter
1
Product Overview
Product Description
The Bulletin 871TM family of inductive sensors is the result of a unique
collection of enhancements—electrical and mechanical—that make these
sensors the optimal solution for harsh duty applications. The machined
stainless steel housing combines an unusually thick sensing face with one-piece
construction. The result is a sensor that is exceptionally resistant to abrasion
and impervious to fluid ingress, a feature especially crucial in applications that
involve cutting fluids and chemical washdowns. The 871TM sensor boasts
sensing ranges two to three times greater than standard models, and offers
increased sensing distance for all metals, including copper and brass.
The IO-Link interface enables consistent communication for diagnosing and
parameterizing through to the sensor level and makes the intelligence that is
already integrated in every 871TM inductive sensor fully available to you. This
design provides particular advantages in the service area (fault elimination,
maintenance, and device replacement), during commissioning (identification,
configuration, and during operation, continuous parameter monitoring, and
online diagnosis). The 871TM sensor operates as a standard discrete sensor on
pin four (black) or communicates via IO-Link on the same pin when
connected to an IO-Link master.
Operating Modes
The sensor can operate in two modes:
• Standard I/O (SIO) Mode: The sensor default operation mode. The
sensor and its output act as a standard inductive sensor without IO-Link
functionality. This mode of operation is active when the sensor is
connected to a digital input device such as a PLC input module, a
distribution box, or an input terminal connection.
• IO-Link Mode : This mode is automatically activated when the sensor is
connected to an IO-Link enabled master device. Upon entering this
mode, the yellow status indicator on the sensor stays solid to indicate
that IO-Link communication has successfully been established with the
master. The sensor transmits parameter and diagnostic information that
can be accessed via PLC process data. No user intervention is required to
enable this functionality within the sensor.