347
Serial Communications
Section 6-1
Related Auxiliary Area Flags for Serial Port 2
Note In the same way as for the existing 1:N NT Link, the status (communicating/
not communicating) of PTs in Serial PLC Links can be checked from the Poll-
ing Unit (CPU Unit) by reading the Serial Port 2 Communicating with PT Flag
(A393 bits 00 to 07 for unit numbers 0 to 7).
Name
Address
Details
Read/write
Refresh timing
Serial Port 2
Communica-
tions Error Flag
A392.04
Turns ON when a com-
munications error occurs
at Serial Port 2.
ON: Error
OFF: Normal
Read
• Cleared when power is turned ON.
• Turns ON when a communications error
occurs at Serial Port 2.
• Turns OFF when the port is restarted.
• Disabled in peripheral bus mode and NT
link mode.
Serial Port 2
Communicating
with PT Flags
(See note.)
A393.00 to
A393.07
When Serial Port 2 is
being used in NT link
mode, the bit correspond-
ing to the Unit performing
communications will be
ON. Bits 00 to 07 corre-
spond to unit numbers 0
to 7, respectively.
ON: Communicating
OFF: Not communicating
Read
• Cleared when power is turned ON.
• Turns ON the bit corresponding to the
unit number of the PT/Polled Unit that is
communicating via Serial Port 2 in NT
link mode or Serial PLC Link mode.
• Bits 00 to 07 correspond to unit numbers
0 to 7, respectively.
Serial Port 2
Restart Bit
A526.00
Turn ON this bit to restart
Serial Port 2.
Read/write
• Cleared when power is turned ON.
• Turn ON to restart Serial Port 2, (except
when communicating in peripheral bus
mode).
Note: The bit is automatically turned OFF
by the system when restart process-
ing has been completed.
Serial Port 2
Error Flags
A528.00 to
A528.07
When an error occurs at
Serial Port 2, the corre-
sponding error bit is
turned ON.
Bit 00: Not used.
Bit 01: Not used.
Bit 02: Parity error
Bit 03: Framing error
Bit 04: Overrun error
Bit 05: Timeout error
Bit 06: Not used.
Bit 07: Not used.
Read/write
• Cleared when power is turned ON.
• When an error occurs at Serial Port 2, the
corresponding error bit is turned ON.
• The flag is automatically turned OFF by
the system when Serial Port 2 is
restarted.
• Disabled during peripheral bus mode.
• In NT link mode, only bit 05 (timeout
error) is enabled.
In Serial PLC Link mode, only the following
bits are enabled.
• Errors at the Polling Unit:
Bit 05: Timeout error
• Errors at Polled Units:
Bit 05: Timeout error
Bit 04: Overrun error
Bit 03: Framing error
Serial Port 2 Set-
tings Changed
Flag
A619.02
Turns ON when the com-
munications conditions of
Serial Port 2 are being
changed.
ON: Changed
OFF: No change
Read/write
• Cleared when power is turned ON.
• Turns ON while communications condi-
tions settings for Serial Port 2 are being
changed.
• Turns ON when the CHANGE SERIAL
PORT SETUP instruction (STUP(237)) is
executed.
• Turns OFF when the changes to settings
are completed.
Summary of Contents for CP1H-CPU - 05-2006
Page 2: ...CP1H X40D CP1H XA40D CP1H Y20DT D CP1H CPU Unit Operation Manual Revised May 2006...
Page 3: ...iv...
Page 11: ...xii TABLE OF CONTENTS...
Page 15: ...xvi...
Page 19: ...xx...
Page 31: ...xxxii Conformance to EC Directives 6...
Page 71: ...40 Function Blocks Section 1 5...
Page 133: ...102 Computing the Cycle Time Section 2 7...
Page 169: ...138 CPM1A Expansion I O Unit Wiring Section 3 6...
Page 411: ...380 Clock Section 6 8...
Page 519: ...488 Replacing User serviceable Parts Section 10 2...
Page 527: ...496 Standard Models Appendix A...
Page 535: ...504 Dimensions Diagrams Appendix B...
Page 628: ...597 Connections to Serial Communications Option Boards Appendix F Connecting to Unit...
Page 629: ...598 Connections to Serial Communications Option Boards Appendix F...
Page 659: ...628 PLC Setup Appendix G...
Page 665: ...634 Index work words 159 write protection 370...
Page 667: ...636 Revision History...