Yokogawa YFGW410 - Manual (Page 199)

G2-6
IM 01W02D01-01EN
l Maximum number of devices connectable to routing device
Up to 4 routing devices and up to 15 IO devices can be connected to the low-level side of rout-
ing device. However, network resources to be used are different between routing device and IO
device, and the topology of up to 4 hops is supported. Therefore, the number of devices connect-
able to each routing device is determined based on the following formula.
Number of IO devices + Number of routing devices x 3 ≤ 30
For example, if there are 4 routing devices, up to 15 IO devices can be connected.
G2.6.2 Maximum Number of Host Systems
YFGW410 supports 240 accesses per second on sum of three field network interfaces. A number
of access from the host systems should be configured within 240 accesses per second. When a
number of accesses from the host system exceeds this, communication between YFGW410 and
the host system may be delayed or unstable. In this case, it requires restarting YFGW410.
A guide line of accessing;
For 1 to 3 Modbus/TCP clients:
Up to 50 accesses per second for each client.
For 4 to 8 Modbus/TCP clients:
Up to 30 accesses per second for each client.
For Modbus/RTU client:
Up to 10 accesses per second.
For field wireless OPC server (SSS7100):
A number of accesses is depended on amount of field wireless devices and publish mes-
sages.
For details, consult our service or sales representative.
G2.6.3 Duocast and Auto I/O Device
The Duocast-specified backbone router cannot be connected to the Auto I/O device in the same
field wireless subnet.