Triguard SC300E TBT Bus Terminator (TBT) Issue 2 October 2005 INTRODUCTION PURPOSE The Bus Terminator (TBT) is a passive end-of-line I/O data bus terminator. The purpose of the TBT is to minimise line ringing and pulse reflections in order to eliminate transmission data errors. This document is intended to provide a general understanding of the TBT sufficient to enable basic maintenance procedures to be effected in the field. Figure 1-1.
Triguard SC300E 2 TBT October 2005 – Issue 2
Triguard SC300E TBT Bus Terminator SPECIFICATION Model TBT Connector DIN41612 style ‘c’ 64-way Overall size (mm) 100H x 18W x 40D Overall size (inches) 3.94H x 0.7W x 1.57D Weight (per set of three) 0.21kg ENVIRONMENTAL SPECIFICATIONS The maximum ambient temperature measured at the hottest point within the Triguard system shall not be greater than 60 degrees centigrade.
Triguard SC300E TECHNICAL DESCRIPTION PHYSICAL The TBT bus terminator consists of a DIN41612 connector with two fixing screws to fit to the bus expansion adaptors (TBA) fitted to the SC300E chassis. THEORY OF OPERATION If the SC300E chassis are arranged with the MPPs at one end of the bus then the TBTs must be fitted at at the other end of the bus as shown in Figure 2-1 .
Triguard SC300E TBT Bus Terminator Figure 2-2 TBT termination diagram - Main chassis at not an end of the bus TBT October 2005 – Issue 2 5
Triguard SC300E SERVICING SCOPE System repair is by replacement of the faulty device. Faulty devices are not repairable in the field. They should be replaced by a serviceable spare and the faulty device returned to for repair. WARNING 1 The fitting or removal of these devices on a running system could result in a plant shutdown. FUNCTIONAL TESTING There are no functional tests for this device available on-line. NOTE Continued inexplicable errors occurring on one channel may mean that the TBT is faulty.
Triguard SC300E TBT Bus Terminator SERVICE SUPPORT SPARE PARTS Spare parts and technical advice can be obtained from your local area offices.
