HP MicroLogix 1761-NET-ENI manual Subnet Mask Auto-Detect Operation, Subnet Mask is in auto-detect

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ENI Configuration (Node 248 to 254) 4-13

Subnet Mask

A subnet mask is used to interpret IP addresses when the network is divided into subnets. If your network is not divided into subnets, then leave the subnet mask at the default or allow the ENI Configuration Utility to assign a default.

The subnet mask defaults to auto-detect mode “out-of-box”. As long as the subnet mask is not manually set, the auto-detect mode follows the rules as shown below:

Table 4.4 Subnet Mask Auto-Detect Operation

When the IP Address is set to:

And the Subnet Mask is in auto-detect:

 

The Subnet Mask is set to:

 

 

Out of Box: 0.0.0.0

Switch-on auto-detect

 

 

Class A address

255.0.0.0

 

 

Class B address

255.255.0.0

 

 

Class C address

255.255.255.0

 

 

Subnet Mask Auto-Detect Rules:

Reading the subnet mask when the IP address is 0.0.0.0 returns a value of 0.0.0.0.

When you manually configure the subnet mask, auto-detect is switched off and the configured mask is used.

The ENI validates the configured subnet mask and if:

The first octet is not equal to 255, the ENI returns status 0x10 and reverts to the previous mask, or

The first octet is 255, but the remaining mask is not proper, the ENI returns status 0x10 and reverts to the previous mask.

The definition of “proper” is that the mask must be a contiguous series of 1’s with no zeroes in between (i.e. 255.0.0.0 or 255.224.0.0 or 255.192.0.0 are valid, but 255.160.0.0 is not).

Security Mask

The Security Mask, when configured, allows you to restrict controller access to sources with IP addresses that are within some prescribed range. For example, if you wanted to restrict all message sources to be from within a company’s allocated IP address range, a Security Mask could be configured that would block any IP address outside that range. This only applies to messages to the controller. Web page access, for example, is not restricted.

Publication 1761-UM006A-EN-P - February 2001

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Contents Cat. No -NET-ENI MicroLogix Ethernet Interface ENIAllen-Bradley is a trademark of Rockwell Automation Table of Contents Chapter Who Should Use this Manual PrefaceFor Read this Document Related DocumentationYour Questions or Comments on this Manual Local Product SupportTechnical Product Assistance Preface P-4 Publication 1761-UM006A-EN-P January Ethernet Connection Non-Ethernet Devices Product OverviewLED Indicators Hardware FeaturesProduct Drawing Description Function ColorDF1 Settings Default Other Options Default SettingsRS-232 Settings Default Other Options Device Compatibility Operating ModesMessaging MailBasic Ethernet Topology Using a Web Browser with the ENIEthernet Networks 6Product Overview Publication 1761-UM006A-EN-P February Low Voltage Directive EMC DirectiveSafety Considerations DIN Rail Mounting MountingRemoval Panel MountingENI Port Identification External Power Supply WiringPin Pin Name Ethernet 8-Pin 10Base-T Connector PortEthernet Connections Maintain ENI Connections Ethernet CablesRS-232 Connector Pin Assignments RS-232 ConnectorRS-232 Cables ENI Connected to Catalog Number Use CableNumber of Connections Dedicated to Operation OverviewOutgoing messages Incoming messagesENI Functional Overview RSLinx on Ethernet PC Connected to EthernetOperation 4Operation RSLogix 6Operation ENI Configuration Utility ENI Configuration Node 248 toRS-232 Baud Rate and TCP/IP Parameters COM Port SettingsSave to ENI RAM or ENI ROM Mail SettingsMessage Routing ResetController Messaging Configuring ENI Data Parameters Target Device Parameters Configuring the ENI E-Mail From String Configuring ENI String ParametersAlways set this to Node Function Data Type Number Options Default Elements Save/Reset Node 248 Save/Reset FunctionNode 249 From String ValueTCP/IP Configuration Parameters Function Data Type Length Node 250 TCP/IP ConfigurationSubnet Mask is set to Subnet Mask Auto-Detect OperationSubnet Mask is in auto-detect Security Mask Behavior Example Condition Node 253 Baud Rate Node 252 Bootp ConfigurationNode 251 E-Mail Server Node 254 Ethernet Hardware Address ENI Baud Rate Options Configuration Value IntegerPeer-to-Peer Messaging Message Routing ENI receives read or Configuration Node TCP/IP addressNode Node100 Node Node101101 Route 1 Address 100 Route 0 Address102 Route 2 Address 103 Route 3 Address148 DF1 Message RoutingFunction ENI Node Data Table Address Use any valid file Size in Elements Use any command supported by your controllerPage Overview Mail Messages Node 50 toSmtp E-Mail Address Configuring E-MailMessage Text Destination AddressesNode Mail Mail Address Description Message ConfigurationMessage Fields to, from, subject Sending an E-Mail Message Mail messages Example Network System DiagramRSLOGIX500 Purpose Scope131.200.50.96 Computer’s Ethernet card Example Network IP Addresses Device131.200.50.95 Throttling Message Instructions Configuring 1761-NET-ENI #1ENI #1 Configuration ENI IP Addr Screen Message Routing Nodes Function Configuring 1761-NET-ENI #2ENI #2 Configuration RSLogix 5000 Ladder Program Message Message Function ENI #2 Configuration Rung Descriptions FunctionENI #2 Configuration Message Instructions Parameters Publication 1761-UM006A-EN-P February ENI #2 Configuration Message ConfigurationTab 10 L20 Controller’s Tags 11 File Mapping in RSLogix 1769-L20 Configure Rslinx13 Modify DF1 Parameters Using RSLInx 14 SLC 5/05 Controller Ladder Program 15 SLC 5/05 Rung 0 MSG General Tab 17 SLC 5/05 Rung 1 MSG General Tab 19 ControlLogix 5550 Controller Ladder Program 20 ControlLogix 5550 Rung 0 Message Configuration Tab 22 ControlLogix 5550 Rung 1 Message Configuration Tab Configuring an Ethernet Driver in Rslinx 25 Configure Ethernet Driver Using RSLinx Flashes for 4 seconds Power-Up SequenceOn solid for 2 seconds Description Color State Indicates Error Code Description of Error Condition Message Instruction Error CodesError Codes Generated by the ENI Pccc Description Cannot execute command due to active IPBs Pccc Description Remote station problem due to downloadConnection not completed before user-specified timeout Reply not received before user-specified timeoutPccc Description No access Pccc Description Command cannot be executedPccc Description Data conversion error Pccc Description Overflow histogram overflow6Troubleshooting Publication 1761-UM006A-EN-P February MicroLogix Web Site Physical SpecificationsDescription ENI Specification Product Dimensions DimensionsMounting Dimensions On the subnet mask TCP/IP Parameters Function FormatGateway Optional1 ZeroInstall the Bootp Server Using BootpEdit the Bootp Configuration File Ethernet TCP/IP Device Name IP Address Hardware AddressDOS-based From See This platform ExecutableParameters if necessary Windows Windows Program ManagerParameter Description Running the DOS-Based UtilityRunning the Windows-Based Utility Glossary Node Pccc Programmable Controller Communications Commands RS-232 UTP Unshielded Twisted Pair Index Allocation of Ethernet connections 3-1Ethernet switchMTA TCP Index Publication 1761-UM006A-EN-P February Page Publication 1761-UM006A-EN-P February