Ethernet Port Status
Original instructions
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Port Status
The status of the Ethernet port depends on the IP address configuration in the application and the setting on the rotary switches:
Application
Switch Setting
DHCP (device name from rotary switches)
BOOTP
STORED
CLEAR IP
DISABLED
None
DEFAULT: Get IP address. (1)
DEFAULT: Get IP address. (1)
DEFAULT: Use default IP address. (1)
DEFAULT: This switch setting implements device’s default IP parameters regardless of the application type.
LED off. This switch setting stops communications between the module and the network, so the application type is inconsequential.
Configured
MISMATCH: Get IP address. (1)
MISMATCH: Get IP address. (1)
NO ERROR: Get IP address from application. (2)
From a server without device name (3)
NO ERROR: Get IP address. (2)
NO ERROR: Get IP address. (2)
NO ERROR: Get IP address with BOOTP. (2)
From a server with device name
NO ERROR: Get IP address. Device name derived from switches (2) (5)
MISMATCH: Get IP address. (1)
NO ERROR: Get IP address with DHCP (device name from application). (2)(4)
Note 1: start default services only
Note 2: start application-configured services
Note 3: Leaving the From a server/Device Name field empty on the IP Configuration tab facilitates communications that are compatible with any rotary switch setting.
Note 4: To use the device name from the IP Configuration tab in the Control Expert application, the lower rotary switch much be set to one of its STORED positions.
Note 5: When the server returns a name that matches the one you configure on the IP Configuration tab, communications are OK. When there is a mismatch, there is a communications error.
Note 6: The M340 Ethernet modules will not receive an IP address from a BOOTP/DHCP server on application download if the IP configuration has not changed.
Elsewhere in this guide is a detailed discussion about deriving the default IP address.
Device Name
CAUTION
UNINTENDED EQUIPMENT OPERATION
The communications port can enter the idle state when the position of the rotary switches does not match the port network configuration in the application. For example, the switches may be set to BOOTP or DHCP while the application calls for a fixed IP address.
Failure to follow these instructions can result in injury or equipment damage.
The device name generated by the rotary switch setting follows this format:
(Note that xx is the value of the upper rotary switch and y is the value of the lower rotary switch.)
NOTE: For information about how the module prioritizes IP addressing options, refer to the discussion on IP address assignment.