Precautions For Using Multiple Cpu System; Precautions For Using Hubs - Mitsubishi Electric QJ81DL96 User Manual

Melsec q series, high speed data logger module
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2
SYSTEM CONFIGURATION

2.6.3 Precautions for using multiple CPU system

The following describes the precautions for using the multiple CPU system.
(1) Access to each CPU module at start-up of multiple CPU system
In the system in which a high speed data logger module is mounted in the multiple
CPU system, an error may occur when accessing other CPU from the high speed
data logger module or accessing the other station via a network module controlled by
other CPU from the high speed data logger module due to the difference of start-up
time of each CPU module. In this case, clear the error in the high speed data logger
module after starting up other CPU.
Section 18.1.2
The start-up of other CPUs can be checked with the special relays, SM220 to SM223.
For the special relays, refer to the user's manual for the CPU module used.

2.6.4 Precautions for using hubs

The following describes the precautions for using the hub.
(1) IEEE802.3x flow control in full-duplex communication
The high speed data logger module does not support the IEEE802.3x flow control.
Therefore, when the load of an Ethernet line is high in the connection with the hub
supporting IEEE802.3x, the data to be sent to the module may be lost.
If the above mentioned phenomenon occurs, add the hubs and reduce the load on the
Ethernet line applied on single hub.
2.6 System Configuration Precautions
2.6.3 Precautions for using multiple CPU system
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