With appropriate software, programming may be done off-line on apersonal computer. A programming terminal should be used forprogram development, program storage, fault diagnostics, systemmonitoring, and application documentation. Software and hardwareshall record the user-defined logic programming on a removable diskmedia for security and backup. Programming terminal should allowmanual forcing of input or output states and provide the resultingstatus on ladder logic displays and/or printouts in on-line and/oroffline modes. All programming should be done using alphanumerictagname references and should allow on-screen comments for afunctional description of an application program. The programmingterminal may provide a display of all system diagnostic states.Off-line programming may provide run emulation capability fortesting and troubleshooting of the application program. Softwarechanges should be done off-line, tested, and then downloaded intothe running application.
2.5.3.1 .ll Ergonomic considerations should be taken intoaccount in the design and layout of the operator console. Items toconsider should include the room arrangement, lighting, climate,air purity, andsound levels. 2.5.3.2 Engineers Workstation2.5.3.2.1 The engineers workstation should be located in theengineers area of the main control room and should be interfaced tothe DCS. 2.5.3.2.2 The engineers workstation should be comprised ofelectronics,storagemedia,color CRT, engineering keyboard, and colorgraphics printer to allow an engineer to configure, download,monitor, trend, document, modify, and verify system softwareconfiguration. The engineers workstation should provide the abilityto develop configurations in an on-line or off-line mode, with orwithout being linked to the DCS system. The engineers workstationshould display color graphics and all other information availableto the DCS. 2.5.3.2.3 Full travel (not membrane), QWERTY-typekeyboards may be provided on the engineers workstation forconfiguration functions. 2.5.3.2.4 Ifan engineers workstation isnot available, then at least one operator station must offer theability to configure all system functions. 2.5.3.3 DisplaysTheoperator consoles should provide both preformatted displays andcustom graphic displays. The preformatted display should bedesigned to allow easy setup. Display designs should allow theoperator to access information and initiate any action in anuncomplicated, effective manner. Display design requires input fromunit operation representatives and other responsible management.Displays as described in the following paragraphs should beprovided.
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2.5.7.2 Two types of general purpose digital communicationinterfaces are recommended:a. An interface to process input/outputdevices such as tankgaugingtransmitters,programmablecontrollers,flow computers, and thelike. The interface should be highly secure. Furthermore, thisinterface should allow data, analogordiscrete, tobedisplayedattheoperators console, and to be freely mixed withother process data in graphics displays. The interface must havebi-directional communication to allow all control functionality andprogramming capability through the DCS. The performance ofinterface for control and alarming functionality should beconsistent with DCS performance as listed in Table l . b. Ahigh-speed bi-directional interface to a computer. The interfaceshould be secure and should allow allprocess data to be transmittedto the computer and allow the computer to transmit any request. Aconfigurable means of securely preventing the interface fromdirectly affecting process control must be provided. Theseinterfaces (hardware and software) should be standard, available,protocols and have standard port configurations. Computer and DCSvendors must be consulted to provide the correct hardware andsoftware. 2ff7e9595c
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