Instruments and Controls

By Staff May 10, 2004

Safety networking system

Safety at Work (SaW) system integrates standard mechanical safety devices into most standard PLCs and operates on one 2-wire flat cable that carries power and signal to each safety device, eliminating the need to wire them to the main cabinet individually. Using the AS-i protocol, the system is comprised of a safety monitor, control platform interface, safety input modules, and SaW e-stop buttons. Safety monitor and control platform interface reside in main control cabinet and are responsible for translation of network safety messages. Safety input modules and e-stop buttons interface directly with mechanical switching components in the field. Safety monitor evaluates code sequences learned during startup.

ifm efector, inc. ifmefector.com Write 311 on PE card

Level controller

LVCN-300 series process level controller is designed from an operator’s point of view, making any process and alarm points visible on the multicolored display graph. High visibility indicators provide at-a-glance status, showing tank level with high and low limits.

Omega Engineering, Inc. omega.com Write 312 on PE card

Safety relays

PSR compact safety relays in ME 22.5 mm housings are equipped with 2-8 normally-open (NO) release current paths and one normally-closed (NC) signaling current path. Modules are available with screw and spring terminations and are designed according to EN50 178 with reinforced isolation. Safety circuit is controlled with one or two channels, with cross-circuit detection for safety Category 4.

Phoenix Contact, Inc. phoenixcon.com Write 313 on PE card

Temperature controllers

Bulletin 900-TC temperature controllers feature multifunction control, easy-to-view LED displays, autotuning and self-tuning, and small footprint. Controllers offer PID or on/off control, up to three alarm outputs, and keypad programming and setup. Optional software enables users to configure and monitor various control parameters.

Rockwell Automation rockwellautomation.com Write 314 on PE card