User manual

IEC61131 User and Reference Manual
April 22, 2008
584
Store and Forward Messaging
Store and forward messaging is not supported by the TeleBUS DF1 protocols.
Default Parameters
All ports are configured at reset with default parameters when the controller is started in
SERVICE mode. The ports use user-defined parameters when the controller is reset in the
RUN mode. The default parameters are listed below.
Parameter
com1
com2
Com3
com4
Baud rate
9600
9600
9600
9600
Parity
none
none
None
none
Data bits
8
8
8
8
Stop bits
1
1
1
1
Duplex
full
full
Half
half
Protocol
Modbus
RTU
Modbus
RTU
Modbus
RTU
Modbus
RTU
Station
1
1
1
1
Rx flow control
none
none
Rx
disable
Rx
disable
Tx flow control
none
none
None
none
Serial time out
60 s
60 s
60 s
60 s
Type
RS-232
RS-232
RS-232
RS-232
Minimum
Protected DF1
Address
0
0
0
0
Maximum
Protected DF1
Address
11534
11534
11534
11534
Notes
com3 is supported only when the SCADAPack Lower I/O module is installed. com4 is
supported only when the SCADAPack Upper I/O module is installed.
To optimize performance, minimize the length of messages on com3 and com4. Examples of
recommended uses for com3 and com4 are for local operator display terminals, and for
programming and diagnostics using the TelePACE program.
I/O Database
The TeleBUS protocols read and write information from the I/O database. The I/O database
is an area of memory that can be accessed by C programs, Ladder Logic programs,
ISaGRAF programs and communication protocols. The I/O database allows data to be
shared between these programs. The I/O database contains user-assigned registers and
general purpose registers.
User-assigned registers map directly to the I/O hardware or system parameter in the
controller. Assigned registers are initialized to the default hardware state or system
parameter when the controller is reset. Assigned output registers do not maintain their
values during power failures. However, output registers do retain their values during
application program loading.
General purpose registers are used by ladder logic, ISaGRAFand C application programs to
store processed information, and to receive information from remote devices. General
purpose registers retain their values during power failures and application program loading.