GE GFK-1541B - Manual (Page 49)

2-36 TCP/IP Ethernet Communications for the Series 90™ PLC User's Manual – May 2002 GFK-1541B
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Advanced User Parameters
Advanced User Parameters may be set for the Ethernet Interface by creating an AUP file and
putting it into the folder for the PLC application.
The AUP file is a text file, created by any convenient text editor. The file name must be
"AUP_0_1.APF". The first line of the file must consist only of the text: "AUP_0_1". Subsequent
lines in the file many contain assignments for Advanced User Parameter values using the syntax:
<parameter name>=value
There should be no space between the parameter name and the equal or between the equal and the
value. Parameter names are the same as described in GFK-1186, TCP/IP Ethernet
Communications for the Series 90 PLC, Station Manager Manual
, in the description of the
PARM command.
Parameter values are converted to lowercase unless enclosed in a pair of double quotes; the
parameter value data depends on the parameter. Numeric parameters are entered in decimal or
hexadecimal format; hexadecimal values must be terminated with an 'h' or 'H' character. IP
address parameters must be entered in standard dotted decimal format. Character string values are
case-sensitive; as with Station Manager commands uppercase parameter values must be enclosed
within a pair of double quotes.
The semicolon character delimits comments; all characters in the line following a semicolon are
ignored. An entire line may be ignored by inserting a semicolon as the first character in the line. A
blank line is also ignored.
Caution
The IEEE 802.3 standard strongly discourages the manal configuration of
duplex mode for a port (as would be possible using Advanced User
Parameters.) Before manually configuring duplex mode for a port using
AUP, be sure that you know the characteristics of the link partner and are
aware of the consequences of your selection. In the words of the IEEE
standard: "Connecting incompatible DTE/MAU combinations such as full
duplex mode DTE to a half duplex MAU, or a full-duplex station (DTE or
MAU) to a repeater or other half duplex network, can lead to severe
network performance degradation, increased collisions, ate collisions, CRC
errors, and undetected data corruption."
Note
If speed and duplex mode of a port is forced using AUP, the switch will no
longer perform automatic cable detection. This means that if you have the
switch port connected to a switch or hub port you must use a crossover
cable. If you have the switch port connected to the uplink port on a switch
or hub or if you have the switch port connected to another Ethernet device
you must use a normal cable.
An example AUP file for the CPU374 to set the IP "Time to Live (TTL)" parameter to the value 5
is shown below. This text would appear in a file named "AUP_0_1.AUP" in the directory of the
folder for the PLC:
AUP_0_1
;
; Set IP TTL to 5 ;
ittl=5