Rockwell Automation 1203 Serial Communications Module Series B - Manual (Page 41)

4–7 Configuring and Interfacing
1203–5.5 September 1995
The data tables have up to eight areas, each having a different
purpose.
1. Parameter Value Read or Write (N10 – N19, N50 – N89).
Reading data from files in this area will cause the Serial
Communications Module to read parameter values from the
SCANport device and send those values as the response to the
read message. Writing data to files in this area will cause the
Serial Communications Module to write that data into SCANport
device parameters.
2. Status of Last Parameter Write (N20). This area is read-only.
When read, the data returned contains status information from the
last parameter write that was performed by the Serial
Communications Module. If no errors occurred during the write,
all of the data returned will be zeros. Read this area beginning at
element number zero.
3. Parameter Read Full (N30 – N38, N90 – N129). This area is
read-only. When read, the data returned consists of 20 words (40
bytes) of information about each parameter including scaling,
parameter text, units text, minimum, maximum, and default
values. When reading this area, set the number of elements to
twenty times the number of parameters to be read.
4. Block Transfer Emulation Area (N40). This area provides a
method for sending and receiving SCANport messages to and
from the SCANport device. This allows you to perform every
SCANport command the device supports. Chapter 5 provides
information about the block transfer emulation functions
available for use with the Serial Communications Module.
To send a SCANport message, write data into this area beginning
with element number zero. Allow sufficient time for the
SCANport device to respond to the message and then read the
response message from this area beginning with element number
zero.
5. Producer/Consumer Emulation Area (N41). Each element in
this area has a different function. Refer to the DIP switch
configuration tables in Chapter 3 for more information.
– Logic Command/Status. Writing sends a Logic Command
to the drive. Reading supplies the SCANport device Logic
Status. Refer to the manual supplied with the SCANport
device for more information.
– Reference/Feedback. Writing sends a reference to the
SCANport device. Reading supplies feedback from the
SCANport device. The meaning of the reference and
feedback values depend on the type of SCANport device.