ProSoft Technology PLX3 Series User Manual page 175

PLX3x Series
Ethernet and Serial Gateways
Command List Parameters
Value
Parameter
DISABLED
Enable
ENABLED
CONDITIONAL
0 to 3999 (for register-
Internal
level addressing)
Address
or
0 to 63999 (for bit-level
addressing)
0 to 65535
Poll Interval
Command-dependent
Reg Count
No Change
Swap Code
Word Swap
Word and Byte Swap
Byte Swap
ProSoft Technology, Inc.
May 26, 2016
Description
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.
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.
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.
Specifies the number of 16-bit registers or binary bits to
be transferred by the command. The range depends on
the Siemens processor and the type of command. See
Maximum Register Counts
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.
(page 185).
Page 175 of 218
SIE Protocol
User Manual