ProSoft Technology MVI46-DFCM - Manual (Page 71)

Reference MVI46-DFCM ♦ SLC Platform
DF1 Communication Module
ProSoft Technology, Inc. Page 71 of 103
October 20, 2008
User Data
All user data is stored in the module's M1 file in registers 0 to 4999. This 5000-
word area is directly accessible from the ladder logic. The COP instruction should
be used to move blocks of data between the user data files and the module's M1
file. This will limit the number of accesses to the M1 data area and provide faster
system response. In the example ladder logic, N31 holds data read from the
module, and N32 stores data to write to the module.
Slave Polling Control and Status
Two data areas can be allocated in the SLC to hold the polling status of each
slave on the master ports. This status data can be used to determine which
slaves are currently active on the port, are in communication error or have their
polling suspended and disabled. If the configuration supplies an address where
this data resides, copy the data from the M1 file to the reserved files in the SLC.
Using special blocks, the processor can enable or disable the polling of selected
slaves.
5.3 Cable Connections
The application ports on the MVI46-DFCM module support RS-232, RS-422, and
RS-485 interfaces. Please inspect the module to ensure that the jumpers are set
correctly to correspond with the type of interface you are using.
Note: When using RS-232 with radio modem applications, some radios or modems require
hardware handshaking (control and monitoring of modem signal lines). Enable this in the
configuration of the module by setting the UseCTS parameter to 1.
5.3.1 RS-232 Configuration/Debug Port
This port is physically an RJ45 connection. An RJ45 to DB-9 adapter cable is
included with the module. This port permits a PC based terminal emulation
program to view configuration and status data in the module and to control the
module. The cable for communications on this port is shown in the following
diagram: