Omron SYSMAC CJ - REFERENCE MANUAL 01-2008 Reference Manual page 1064

Serial Communications Instructions
Flags
Precautions
Related Flags and Words
Examples
Differences between CPU Units
If the PLC is turned OFF and then ON again after STUP(237) has been used
to change the communications parameters, the new parameters will be
retained or will revert to the previous parameters, depending on the CPU Unit.
CPU Unit
CS1-H, CJ1-H, If the PLC is turned OFF and then ON again, the communications
CJ1M, or CS1D parameters revert to the settings that existed before they were
changed with STUP(237).
CS1 If the PLC is turned OFF and then ON again, the communications
parameters set with STUP(237) are retained.
Name Label
Error Flag ER
Communications parameters consist of the protocol mode, baud rate, data
format (protocol macro transmission method and protocol macro maximum
communications data length), and other parameters. Refer to CS/CJ-series
Programmable Controllers Operation Manual (W339) or CS/CJ-series Serial
Communications Boards and Serial Communications Unit Operation Manual
(W336) for the serial port that is to be set for details.
The following flags can be used as required when executing STUP(237).
These flags are in the Auxiliary Area.
Name
Peripheral Port Parameters
Changing Flag
RS-232C Port Parameters
Changing Flag
Port Parameters Changing
Flags for ports 1 to 4 on
Serial Communications
Units 1 to 15.
Port Parameters Changing
Flags for ports 1 to 4 on the
Serial Communications
Board (CS Series only)
When CIO 000000 turns ON in the following example, the communications
parameters for serial port 1 of the Serial Communications Board (Inner Board)
are changes to the settings contained in the 10 words from D00100 to
D00109. In this example, the setting are changed the protocol mode to the
protocol macro mode.
Status of communications parameters
Operation
ON if the values in C are not within range.
ON if STUP(237) is executed for a port whose Communi-
cations Parameter Changing Flag is already ON.
ON if STUP(237) is executed in an interrupt task.
OFF in all other cases.
Address
A61901 ON when the communications param-
eters are being changed for the periph-
eral port.
A61902 ON when the communications param-
eters are being changed for the RS-
232C port.
A620 bit 01 to ON when the communications param-
bit 04 eters are being changed for a port on a
to A635 bit 01 Serial Communications Unit.
to bit 04
A63601 to ON when the communications param-
A63604 eters are being changed for a port on
the Serial Communications Board.
Section 3-24
Contents
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