1756-RM001B-EN-P, Using ControlLogix in SIL2 ... - Tuv-fs.com
1756-RM001B-EN-P, Using ControlLogix in SIL2 ... - Tuv-fs.com 1756-RM001B-EN-P, Using ControlLogix in SIL2 ... - Tuv-fs.com
5-2 ControlLogix Communications ModulesControlNet Bridge ModuleThe ControlNet bridge module (1756-CNB & 1756-CNBR) provides forthe communications between ControlLogix chassis over theControlNet network.ControlNet CablingFor remote racks, a single RG6 coax cable is required for ControlNet.Although it is not a requirement to use redundant media with the1756-CNBR, it does provide higher system reliability. Redundantmedia is not required for SIL2 operation.ControlNet Module Diagnostic CoverageAll communications over the passive ControlNet media occur via CIP,which guarantees delivery of the data. All modules independentlyverify proper transmission of the data.Ethernet ModuleThe Ethernet bridge module (1756-ENBT) provides for thecommunications from one ControlLogix chassis to other devices overthe Ethernet network.The Ethernet link is based on industry-standard CIP network protocolrunning on top of TCP and UDP using 32-bit CRC. Also, TCP and UDPwith 16-bit Checksums are running on top of Ethernet.Ethernet Versus ControlNetAlthough it may be acceptable to use Ethernet for specificapplications, such as program download, Ethernet requires a switchfor a “star” configuration. Rockwell Automation does not sell orreference a SIL2/SIL3 Ethernet switch. Also Ethernet is an “active”media whereas ControlNet uses a “passive” media (that is, very lowfailure rate).Publication 1756-RM001B-EN-P - October 2003
ControlLogix Communications Modules 5-3Recommendations forCommunications ModulesUseUsers must consider the recommendations listed below when usingSIL2-certified communications modules:• When installing ControlLogix communications modules, followthe information provided in the documentation listed in theRelated Communications Modules Documentation section onpage 5-4.• Use Ethernet for communications to Human-to-MachineInterfaces (HMI) and programming terminals only. For moreinformation on using HMI, see Figure 1.2 on page 1-4 andChapter 10, Use and Application of Human to MachineInterfaces.• Remote I/O chassis should be connected via ControlNet only.• Peer-to-peer communication is restricted to ControlNet only andshould occur only if the controller in the safety loop is sharingits own information (for example, via produced tags) with othercontrollers outside the loop.• For exchanging I/O data, use listen-only connections.• For exchanging non-I/O data, use producer/consumer tags.• Typically, no devices must be permitted to write data to thecontroller in the safety loop. The only exception to thisrecommendation is the use of HMI devices. For moreinformation on how to use HMI in the safety loop,see Chapter 10.For more information on connecting remote I/O chassis andpeer-to-peer communication, see Figure 1.2 on page 1-4.Publication 1756-RM001B-EN-P - October 2003
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5-2 <strong>ControlLogix</strong> Communications ModulesControlNet Bridge ModuleThe ControlNet bridge module (<strong>1756</strong>-CNB & <strong>1756</strong>-CNBR) provides forthe <strong>com</strong>munications between <strong>ControlLogix</strong> chassis over theControlNet network.ControlNet Cabl<strong>in</strong>gFor remote racks, a s<strong>in</strong>gle RG6 coax cable is required for ControlNet.Although it is not a requirement to use redundant media with the<strong>1756</strong>-CNBR, it does provide higher system reliability. Redundantmedia is not required for <strong>SIL2</strong> operation.ControlNet Module Diagnostic CoverageAll <strong>com</strong>munications over the passive ControlNet media occur via CIP,which guarantees delivery of the data. All modules <strong>in</strong>dependentlyverify proper transmission of the data.Ethernet ModuleThe Ethernet bridge module (<strong>1756</strong>-<strong>EN</strong>BT) provides for the<strong>com</strong>munications from one <strong>ControlLogix</strong> chassis to other devices overthe Ethernet network.The Ethernet l<strong>in</strong>k is based on <strong>in</strong>dustry-standard CIP network protocolrunn<strong>in</strong>g on top of TCP and UDP us<strong>in</strong>g 32-bit CRC. Also, TCP and UDPwith 16-bit Checksums are runn<strong>in</strong>g on top of Ethernet.Ethernet Versus ControlNetAlthough it may be acceptable to use Ethernet for specificapplications, such as program download, Ethernet requires a switchfor a “star” configuration. Rockwell Automation does not sell orreference a <strong>SIL2</strong>/SIL3 Ethernet switch. Also Ethernet is an “active”media whereas ControlNet uses a “passive” media (that is, very lowfailure rate).Publication <strong>1756</strong>-<strong>RM001B</strong>-<strong>EN</strong>-P - October 2003
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