1756-RM001B-EN-P, Using ControlLogix in SIL2 ... - Tuv-fs.com

ControlLogix I/O Modules 6-5Table 6.2 lists the digital input modules that are suitable for use inSIL2 applications.Table 6.2 ControlLogix Digital Input Modules Suitable for SIL2 ApplicationsModule Type: Catalog Number: Description:Diagnostic Input Modules 1756-IB16D DC Diagnostic Input Module1756-IA8DAC Diagnostic Input ModuleStandard Input Modules 1756-IB16I DC Isolated Input Module1756-IA16IAC Isolated Input ModuleGeneral Considerations when using Any ControlLogix DigitalInput ModuleRegardless of the type of ControlLogix input module used, there are anumber of general application considerations that users must followwhen applying these modules in a SIL2 application:• Proof Tests - Periodically (for example, once every severalyears) a System Validation test must be performed. Manually, orautomatically, test inputs to make sure that all inputs areoperational and not stuck in the ON or OFF state. Inputs mustbe cycled from ON to OFF or OFF to ON. For additionalinformation on Proof Tests, see page 1-5 and Figure 9.1 onpage 9-5.• Always use a direct connection with diagnostic input moduleslocated in remote chassis.• Wire sensors to separate input points on two separate modules.• Configuration parameters (for example, RPI, filter values) mustbe identical between the two modules.• The same controller must own both modules.For operational state information, see Chapter 1, SIL Policy.Publication 1756-RM001B-EN-P - October 2003