Functions Restricted In A Redundant System - Mitsubishi Electric MELSEC iQ-RJ71EN71 User Manual

Functions restricted in a redundant system

The following table lists the functions restricted when the RJ71GF11-T2 is used in a redundant system.
FUNCTIONS
Transient transmission
IP packet transfer function
Safety communication
function
CC-Link IE Field Network synchronous
communication function
1 FUNCTIONS
94
1.7 Redundant System Function
Restrictions
• To perform the transient transmission specifying the control system or standby system, acquire the
current target station address (address of the control system or standby system) by using the module
FB (RedundantSystem_GetAddress) and access the acquired address. ( MELSEC iQ-R
Ethernet/CC-Link IE Function Block Reference)
• Precautions exist for communications with different networks when the networks contain a redundant
system. ( Page 38 When the networks contain a redundant system)
• When dynamic routing is being used in a redundant line configuration, since the destinations of
transient transmission with different networks are all restricted to stations on control system networks,
communications with standby system networks are not possible.
• Precautions exist for when the dedicated instructions are used to a redundant system. ( Page
337 Precautions for dedicated instructions)
■IP address setting of the Ethernet-equipped module
Use the IP address of the control system to maintain communications when system switching occurs.
( MELSEC iQ-R Ethernet User's Manual (Application))
■Communications at the time of system switching
When system switching occurs in a redundant system on a communication path, communications may
be interrupted or data may be lost. Also, communications may be disabled during system switching. If
an error occurs in communications, resend data from the request source.
■When the Ethernet-equipped module connecting to an Ethernet device is redundant
• Execute this function via the control system when using the dynamic routing. An error occurs if
transfer operation is executed via the standby system. Set "Routing Setting" of "CPU Parameter"
when executing this function via the standby system.
• Set "Routing Setting" of "CPU Parameter" when executing this function even when stop errors exist in
the CPU modules of both systems.
■For a redundant master station
When the Process CPU
is used The safety communication function cannot be used.
■For a redundant slave station
Safety communications cannot be used for a redundant system station.
Safety communications can be used for safety stations other than the redundant system.
■For redundant line
The safety communication function cannot be used.
■For a redundant slave station
When the SIL2 Process
CPU is used Safety communications cannot be used for a redundant system station. When using the safety
communication function in the SIL2 Process CPU, refer to the following.
( Page 112 System using the SIL2 Process CPU)
■For a redundant master station
CC-Link IE Field Network synchronous communication cannot be used.
■For a redundant slave station
CC-Link IE Field Network synchronous communication cannot be used for redundant system stations.
CC-Link IE Field Network synchronous communication can be used for stations other than the
redundant system.
■For redundant line
CC-Link IE Field Network synchronous communication cannot be used.