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C-1
GFK-1004B
Appendix C Soft Switch Parameters
This appendix describes the parameters and settings that may be modified when
configuring the Ethernet Interfaces. It also describes the methods for configuring the
Ethernet Interface through either the Station Manager or the Logicmaster 90-70
Configurator.
The Ethernet Interface has a set of fundamental parameters stored in non-volatile
memory (retentive when power is off). This memory is called Electronically Erasable
Programmable Read Only Memory (EEPROM). These parameters are maintained
indefinitely with or without power. This set of parameters is called “Soft Switches.” Soft
Switches specify basic parameters in software rather than using hardware jumpers or
switches. These parameters are required to support the loader and communications
software of the Ethernet Interface. Soft Switches are set to default values at the factory
that are correct for most LAN installations. Review the values in Table C-1 to determine
if the factory default values are appropriate for your network.
Note
TCP/IP parameters IP Address, Subnet Mask, Gateway IP Address and
Name Server IP Address are technically soft switches, but are neither
displayable nor changeable with SOSW/CHSOSW nor described in this
section.
Config Mode
The Logicmaster 90-70 configuration mode ( set in the Config Mode field) has a major
effect on which Soft Switch parameters are in use. When the configuration mode is
MMS-ETHERNET, all Soft Switches described here are used. The switches may then be
modified using the PLC Programmer or the CHSOSW command. When the
configuration mode is TCP/IP, only the Station Address and Network Load Address
Software Switches may be modified for the Ethernet Interface. These Software Switches
may only be modified using the PLC Programmer; that is, they may not be set using the
CHSOSW command. When using TCP/IP configuration mode, other Soft Switches are
“hard-coded” as follows: Load Source is ALT, LAN Online is YES, and Backplane on line
is YES.
The MMS-ETHERNET configuration mode is intended for those users who are using:
(a) an Ethernet Interface with PROM version less than 2.00 or
(b) a PLC CPU with firmware version less than 5.03.
The TCP/IP configuration mode is intended for those users who are using