MVI56-DH485R
♦
ControlLogix Platform
Module Configuration
DH485 Interface Module for Remote Chassis
User Manual
Page 32 of 97
ProSoft Technology, Inc.
August 27, 2009
2.4.11 File Number
This field defines the file number to access. This field is ignored for CIF file
access and should be set to 0. For Bit, Timer, Counter, Control, Integer, and
Float data types, a maximum value of 255 is valid.
2.4.12 Element Number
This field defines the first element in the file specified to be associated with the
command. For a CIF file, this parameter is given as the byte location. For Bit,
Timer, Counter, Control, Integer, and Float data types, the maximum value is
255. For CIF data types the maximum value is 510.
Maximum Element Counts for Read/Write Commands
The maximum number of elements requested from a remote node is determined
by the file type and function code utilized in the command. The following table
lists the maximum element count for each file type:
File Type
Bytes/Elements
Read Result
Write Result
Status 2
83 83
Bit 2 118
115
Timer 6 39 38
Counter 6
39 38
Control 6
39 38
Integer 2
118 115
Float 4 59
57
CIF 1 236
234
2.5
[DH485 Port x Maps]
Note:
This section applies only when the DH485 module is operating in Slave mode.
The [DH485 Port x Maps] section for each port defines file override mappings for
the module. Use of these maps provides flexibility defining the file emulation
supported in the slave driver of the module. Up to 50 maps can be defined in the
module to override the fixed file-mapping feature of the module.Each file map
entered in the configuration file has the same format.
