3HAC021456-001/04

AMIKON LIMITED

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Yokogawa DCS

Honeywell DCS

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Compatibility of existing systems with communication interfaces CI920* FW 1.4.x The communication interfaces CI920A* FW 2.1 can also be used to replace the communication interfaces CI920* FW 1.4.1 or CI920* 1.4.2. You should power down and de-energize the relevant S900 station (TU921*) for the time of the communication interface replacement. A seamless replacement cannot be guaranteed when using the intermediate step via CI920* 1.5.9 (CI920* 1.4.x -> CI920* 1.5.9 -> CI920A* 2.1). In addition to the already described differences (chapter 1) and modified behavior (chapter 2.2.2.3) of CI920A* FW2.1 and CI920* FW1.5.9, also observe the functional differences of the communication interfaces CI920* FW1.5.9 and CI920* FW1.4.x according to Release Notes BDD015032R0101 [3]. 4. Interconnection at the intrinsically safe fieldbus system RS485 Two types of fieldbus installations are differentiated for the interconnection of the communication interfaces CI920AS and CI290AB on an intrinsically safe fieldbus system: (1) Manufacturer-specific, intrinsically safe fieldbus system RS485 previously used for S900 (acc. to R. STAHL) (2) Intrinsically safe fieldbus system RS485-IS according to PROFIBUS int. Guideline 4.1 Manufacturer-specific, intrinsically safe fieldbus system RS485 previously used for S900 (acc. to R. STAHL) For an existing fieldbus system, the CI920AS or CI920AB are interconnected as replacement for CI920S or CI920B. Start of bus (master side) S900 at center of bus S900 at end of bus Installation type PROFIBUS isolating repeater/ coupler PROFIBUS connector S900 communication interface PROFIBUS connector S900 communication interface 1 BI912S BP910S (bus termination: off) CI920S, CI920B, CI920AS, CI920AB BP910S (bus termination: on) CI920S, CI920B, CI920AS, CI920AB 2 BI913S 3 BI914S 4 BI933S 5 BI934S The existing fieldbus installations have thus been built up according to one of the following Manual Installation Guides: [4], [5], [6], [7], [8], [9], [10] or [11]. The interconnection of the intrinsically safe fieldbus system performed according to the indicated chapter: ‘Intrinsically Safe Fieldbus System’. The electrical connection data of the new communication interfaces CI920AS/CI920AB (ATEX ...) and of the installed communication interfaces CI920S/CI920B (ATEX …) are comparable. It is therefore not mandatorily necessary to once more calculate the interconnection in case the fieldbus installation has not been changed and if this is not demanded by the plant installation rules. You should, however, update the documentation to the latest status.