211
Automatic Clock Adjustment and Specifying Servers by Host Name
Section 6-7
6-7
Automatic Clock Adjustment and Specifying Servers by
Host Name
6-7-1
Automatic Clock Adjustment Function
The built-in clock of the PLC connected to the Ethernet can be automatically
adjusted, with the SNTP server clock taken as the standard. Automatic adjust-
ments through the entire system enable the various records generated by pro-
duction equipment to be managed according to clock information and
analyzed.
The PLC can acquire clock information from the SNTP server at a particular
time or when a dedicated bit turns ON, and it can refresh the internal clock
information automatically.
Note
(1) An SNTP server is required to use this function.
(2) SNTP server settings require specialized knowledge, so they should al-
ways be handled by the network administrator.
(3) When using the Internet, depending on the condition of the network it
may not be possible to acquire the clock information.
6-7-2
Specifying Servers by Host Name
SNTP servers can be specified by host name rather than by IP address by
using of the DNS client function.
This enables automatic searches for IP addresses for purposes such as sys-
tem checking, even when the IP addresses for servers have been changed.
Note
(1) A DNS server is required to specify servers by IP address.
(2) The IP address is specified directly for the DNS server.
MAC Address:
01234567890A
00
NC
02
04
06
08
10
00
02
04
06
08
10
01
COM
03
05
07
09
11
01
03
05
07
09
11
BKUP
ERR/ALM
LNK/ACT
SYSMAC
CP1L
POWER
RUN
INH
1
00
01
02
03
04
06
00
01
03
04
06
COM
02
COM
05
07
COM
COM(V+)
05
07
ANALOG INPUT
V1+ V2+ COM
2
Ethernet
SNTP server
Clock information
CP1L-EL/EM
CPU Unit
MAC Address:
01234567890A
00
NC
02
04
06
08
10
00
02
04
06
08
10
01
COM
03
05
07
09
11
01
03
05
07
09
11
BKUP
ERR/ALM
LNK/ACT
SYSMAC
CP1L
POWER
RUN
INH
1
00
01
02
03
04
06
00
01
03
04
06
COM
02
COM
05
07
COM
COM(V+)
05
07
ANALOG INPUT
V1+ V2+ COM
2
Ethernet
DNS server
Host name
IP address
CP1L-EL/EM
CPU Unit
Summary of Contents for CP1L-EL20DR-D
Page 3: ...CP1L EL20D CP1L EM30D CP1L EM40D CP1L EL EM CPU Unit Operation Manual Produced July 2017...
Page 4: ...iv...
Page 10: ...x...
Page 22: ...xxii...
Page 34: ...xxxiv Software Licenses and Copyrights 7...
Page 192: ...158 Trial Operation and Debugging Section 5 3...
Page 250: ...216 Automatic Clock Adjustment and Specifying Servers by Host Name Section 6 7...
Page 666: ...632 Trouble Shooting Section 11 7...
Page 696: ...662 Standard Models Appendix A...
Page 805: ...771 Connections to Serial Communications Option Boards Appendix F Connecting to Unit...
Page 806: ...772 Connections to Serial Communications Option Boards Appendix F...
Page 836: ...802 PLC Setup Appendix G...
Page 838: ...804 TCP Status Transitions Appendix H...
Page 840: ...806 Ethernet Network Parameters Appendix I...
Page 842: ...808 Buffer Configuration CP1L EL EM Appendix J...
Page 844: ...810 Ethernet Specifications Appendix K...
Page 851: ...Index 817 work words 118 write protection 447...
Page 852: ...818 Index...
Page 854: ...820 Revision History...
Page 855: ......