Yokogawa YFGW410 - Manual (Page 198)

<G2. Field Wireless Network>
G2-5
IM 01W02D01-01EN
G2.5 Standard Battery Life
The Update time of a field wireless device and the battery life in a standard specification environ-
ment is shown below.
The battery life of an IO device is constant irrespective of the network form or the route configura-
tion. However, the battery life of a routing device varies greatly according to the route connection.
The larger the number of directly connected low-level devices, the shorter the battery life. In addi-
tion, the battery life greatly changes depending on temperature conditions. Note that the battery
life may become shorter than the following data depending on device use conditions.
Update Time
Expected battery life when the IO device is set to Routing
Device
10 seconds x 0.1 - 0.4
30 seconds x 0.1 - 0.5
60 seconds x 0.1 - 0.6
G2.6 Restrictions
G2.6.1 Restrictions on Number of Connectable Devices by
Network Resources
l Maximum number of connectable output devices
There are two type of field wireless devices; input devices which has function to read values from
sensors, and output devices which has function to write values to objects to be controled.
Input devices have following process parameters;
for analog input data: PV
for digital input data : PV_B
The host system can read above parameters through YFGW410. Up to 500 input devices can be
connected to YFGW410.
Output devices have following process parameters;
for analog input data: Readback (Actual value of the OP)
for analog output data: OP
for digital input data: Readback_B (Actual value of the OP_B)
for digital output data: OP_B
The host system can read and/or write above parameters through YFGW410. If the host system
accesses to each output device with data tracking, up to 250 output devices can be connected to
YFGW410.
l Maximum number of field wireless devices connectable to field wire-
less subnet
Up to 100 field wireless devices can be connected to each field wireless subnet. However,
network resources to be used are different between routing device and IO device; therefore, the
number of devices connectable to each field wireless subnet is restricted based on the following
formula.
Number of IO devices + Number of routing devices x 3 ≤ 100
For example, if there are 4 routing devices, up to 88 IO devices can be connected.