Banner SC26-2 Instruction Manual

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Banner SC26-2 Instruction Manual Manual pdf 69 page image

Fault ExclusionAn important concept within the requirements of ISO 13849-1 is the probability of the occurrence of a failure, which canbe reduced using a technique termed "fault exclusion." The rationale assumes that the possibility of certain well-definedfailure(s) can be reduced via design, installation, or technical improbability to a point where the resulting fault(s) can be,for the most part, disregarded—that is, "excluded" in the evaluation.Fault exclusion is a tool a designer can use during the development of the safety-related part of the control system and therisk assessment process. Fault exclusion allows the designer to design out the possibility of various failures and justify itthrough the risk assessment process to meet the requirements of ISO 13849-1/-2.6.3.2 Safety Input Device PropertiesThe Safety Controller is configured via the PC Interface to accommodate many types of safety input devices. See AddingInputs and Status Outputs on page 19 for more information on input device configuration.Reset Logic: Manual or Automatic ResetA manual reset may be required for safety input devices by using a Latch Reset Block or configuring a safety output for alatch reset before the safety output(s) they control are permitted to turn back On. This is sometimes referred to as “latch”mode because the safety output “latches” to the Off state until a reset is performed. If a safety input device is configuredfor automatic reset or “trip” mode, the safety output(s) it controls will turn back On when the input device changes to theRun state (provided that all other controlling inputs are also in the Run state).Connecting the Input DevicesThe Safety Controller needs to know what device signal lines are connected to which wiring terminals so that it can applythe proper signal monitoring methods, Run and Stop conventions, and timing and fault rules. The terminals are assignedautomatically during the configuration process and can be changed manually using the PC Interface.Signal Change-of-State TypesTwo change-of-state (COS) types can be used when monitoring dual-channel safety input device signals: Simultaneous orConcurrent.Input CircuitInput Signal COS Timing RulesStop State—SO turns Off when3: Run State—SO turns On when4:Dual-Channel A and B Complementary2 Terminals 3 Terminals 2 Terminals, PNP24V OFFONAt least 1 channel (A or B) input is in theStop state.Simultaneous: A and B are both in theStop state and then both in the Run statewithin 3 seconds before outputs turn On.Concurrent: A and B are concurrently inthe Stop state, then both in the Run statewith no simultaneity to turn outputs On.Dual-Channel A and B2-Ch, 2 TerminalPNP2-Ch, 2 Terminals 2-Ch, 3 Terminals 2-Ch, 4 Terminals24V ONON3 Safety Outputs turn Off when one of the controlling inputs is in the Stop state.4 Safety Outputs turn On only when all of the controlling inputs are in the Run state and after a manual reset is performed (if any safety inputs areconfigured for Manual reset and were in their Stop state).XS/SC26-2 Safety Controller69