PLX30 Series
SIE Protocol
Ethernet and Serial Gateways
User Manual
ProSoft Technology, Inc.
Page 177 of 200
September 19, 2012
Command List Parameters
Parameter
Value
Description
Enable
DISABLED
ENABLED
CONDITIONAL
Specifies if the command is to be executed and under what
conditions.
Disabled (0)
- the command is disabled and will not be
executed in the normal polling sequence.
Continuous (1)
- the command will be executed upon each
scan of the Command List if the Poll Interval is set to zero (0). If
the
Poll Interval
is set to a non-zero value, the command will be
executed when the interval timer for that command expires.
Conditional (2)
- the command will execute only if the internal
data associated with the command changes.
Internal
Address
0 to 3999
(for
register-level
addressing)
or
0 to 63999
(for
bit-level
addressing)
Specifies the database address in the gateway's internal
database to use as the destination for data brought in by a read
command, or as the source for data to be sent out by a write
command. The database address is interpreted as a bit address
or a 16-bit register (word) address, depending on the Siemens
Industrial Ethernet’s Data Type used in the command. If Data
Type
– Bool is used in the command list, then the database
address will be interpreted as a bit address. When any other
data types are used, then the database address is interpreted
as a 16-bit word (register) address.
Poll Interval
0 to 65535
Specifies the minimum interval between executions of
continuous commands. The value is in tenths of a second.
Therefore, if a value of 100 is entered, the command will
execute no more frequently than once every 10 seconds.
Reg Count
Command-
dependent
Specifies the number of 16-bit registers or binary bits to be
transferred by the command. The allowable range depends on
the Siemens processor addressed by the command, and on the
type of command used. See
Swap Code
No Change
Word Swap
Word and Byte
Swap
Byte Swap
Specifies if and how the order of bytes in data received or sent
is to be rearranged. This option exists to allow for the fact that
different manufacturers store and transmit multi-byte data in
different combinations. This parameter is helpful when dealing
with floating-point or other multi-byte values, as there is no one
standard method of storing these data types. The parameter
can be set to rearrange the byte order of data received or sent
into an order more useful or convenient for other applications.
No change(0)
- No change is made in the byte ordering (1234 =
1234)
Word Swap (1)
-The words are swapped (1234=3412)
Word and Byte Swap (2)
- The words are swapped, then the
bytes in each word are swapped (1234=4321)
Byte Swap (3)
- The bytes in each word are swapped
(1234=2143)
These swap operations affect 4-byte (or 2-word) groups of data.
Therefore, data swapping using these
Swap Codes
should be
done only when using an even number of words, such as when
32-bit integer or floating-point data is involved.
Node IP
Address
xxx.xxx.xxx.xxx
IP address of the Siemens processor being addressed by the
command.
PLC Type
S7-200
S7-300/S7-
Type of Siemens processor being addressed by the command.
