YOKOGAWA Admag TI Series User Manual page 24

The devices within the address range written as "Unused" in Figure 4.1 cannot be used on
Fieldbus. For other address ranges, the range is periodically checked to identify when a new
device is mounted. Care must be taken to keep the unused device range as narrow as possible
so as to lessen the load on Fieldbus.
V(FUN)
V(FUN)+V(NUN)
Figure 4.1 Available Range of Node Addresses
To ensure stable operation of Fieldbus, determine the operation parameters and set them to
the LM devices. When the parameters in Table 4.2 are to be set, the worst-case value of all the
devices to be connected to the same Fieldbus must be used. Refer to the specifications of each
device for details. Table 4.2 lists specification values of this product.
Table 4.2 Operation Parameter Values of This Product to be Set to LM Devices
Symbol
V(ST) Slot-Time
V(MID) Minimum-Inter-PDU-Delay
V(MRD) Maximum-Response-Delay
0x00
Not used
0x0F
0x10
Bridge device
0x13
0x14
LM device
Unused
BASIC device
0xF7
0xF8
Default address
0xFB
0xFC
Portable device address
0xFF
Parameter Name
Indicates the time necessary for the immediate reply of the device.
Unit of time is in octets (256 µs). Set the maximum specification for
all devices. For this product, set a value of 4 or greater.
Indicates the minimum value of communication data intervals to
start reply. Unit of time is in octets (256 µs). Set the maximum
specification for all devices. For this product, set a value of 4 or
greater.
Indicates the worst-case time elapsed until a reply is received.
Since the unit is Slot-time, set the value so that V (MRD) x V (ST)
is the maximum value of the specifications for all devices. For this
product, set V(MRD) x V(ST) to a value of 12 or greater.
<4. Configuration>
V(NUN)
F0401.EPS
Description and Setting
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IM 01E21A02-03EN