ProSoft Technology MVI46-DFCM - Manual (Page 70)

MVI46-DFCM ♦ SLC Platform Reference
DF1 Communication Module
Page 70 of 103 ProSoft Technology, Inc.
October 20, 2008
backplane errors are recognized. When a successful transfer is recognized, the
module will resume communications on the network.
The Error Status Pointer parameter defines the location in the module's database
where the error/status data will be stored. If the value is set to -1, the data will not
be stored in the user data area. A value between 0 and 4939 will cause the
module's program to store the data at the specified location.
Port Parameters
These parameters define the operation of each of the DF1 ports on the module.
Refer to MVI46-DFCM Configuration Data Definition for the definition of each
parameter.
DF1 Master Commands
These records define the commands in the master command list. The definition
of each parameter required for each command is given below:
Command Description
Enable
This parameter defines if the command will be executed or will be disregarded. The following values
are valid: 0=Disables the command and it will not execute. 1=The command will be considered for
execution each scan of the command list and will be controlled by the PollInt parameter. 2=The
command will only execute if the data associated with the command has changed since the
command was last issued. This option is only available for write commands. 999=The command will
issue a poll command to the slave unit indicated in the command. This option is only valid for a half-
duplex network.
IntAddress This parameter specifies the starting internal register address to be associated with the command.
Valid entry for this parameter is 0 to 9999.
PollInt This parameter defines the Minimum time in tenths of a second to wait between the execution of
continuous commands (Enable=1). This poll interval command can be used to lighten the
communications load on a busy network. Valid entry for this parameter is 0 to 65535.
Count This parameter defines the number of registers to be considered by the command. Valid entry for
this parameter is 1 to 100.
Swap This parameter specifies if the data used in the command must be altered when a reading data from
a node on the network. Values that can be assigned are as follows: 0=no swapping of data, 1=swap
word values, 2=swap word and byte values and 3=swap byte values. This option is used when
interfacing the module with ASCII and floating-point data on other devices.
Node This parameter assigns the DF1 slave node address for the module to reach with the command on
the network. This parameter can be assigned values from 0 to 255.
Func This parameter specifies the function to be performed by the command. Valid entries are those
defined in the DF1 Command Set for ProSoft Technology. Communication Modules document.
Parameter_1 to
Parameter_4 These are the parameters required for the selected function. Each command has its own unique set
of one or more parameters. Refer to the DF1 Command Set document for a complete list of
command parameters.
Status Data
This data area views the status of the module. Use this data to monitor the state
of the module at a "real-time rate". Refer to the Reference chapter for a complete
listing of the data stored in this object. This data can be read from the module's
M1 file starting at register 7600. User data file N30 is defined in the example
ladder logic for this purpose.