BME P58 xxxx Clock

The CPU clock for internal variables time stamping is provided by either an external or internal time source.

External time source:

The CPU is set as an NTP client and synchronizes its internal clock on an Ethernet NTP server usually located on the control network.
Internal time source:

The CPU is set as an NTP server. It uses its internal clock and acts as an Ethernet NTP server for devices connected to the Ethernet network on which the CPU is connected.

Setting the CPU as an NTP Client in Control Expert

Proceed as follows to access and set the NTP parameters in Control Expert:

Step

Action

1

In the Project Browser, double-click Project > Configuration > PLC bus.

2

In the PLC bus dialog box, double-click the drawing with 3 Ethernet ports in the middle of the CPU.

3

Select the NTP tab to set the NTP parameters.

4

Select NTP Client parameter in NTP : field.

5

In the NTP Server Configuration field, enter the NTP server IP addresses and set the polling period.

NOTE: The polling period represents the time elapsed before internal clock resynchronization with the Ethernet NTP server.

Example of NTP tab content with a CPU set as NTP client:

Setting the CPU as an NTP Server in Control Expert

Proceed as follows to access and set the NTP parameters in Control Expert:

Step

Action

1

In the Project Browser, double-click Project > Configuration > PLC bus.

2

In the PLC bus dialog box, double-click the drawing with 3 Ethernet ports in the middle of the CPU.

3

Select the NTP tab to set the NTP parameters.

4

Select NTP Server parameter in NTP : field.

5

NTP Server Configuration field enables to set the polling period.

NOTE: When the CPU is set as an NTP server, the polling period is a parameter used by remote modules in the PAC (for example a BM• CRA 312 10 module). It represents the time elapsed before remote modules internal clock resynchronization with the CPU NTP server.