<3. Getting Started>
18
IM 01E21A02-03EN
3.2 Host Setting
To activate Fieldbus, the following settings are required for the host. Particularly, pay attention so
that the address range to use includes setting values of this product.
IMPORTANT
Donotturno󰀨thepowerimmediatelyaftersetting.
To improve the reliability of the device, processing to store data to EEPROM is duplexing.
Ifthepoweristurnedo󰀨within60secondsaftersettingismade,themodiedparametersarenot
saved, and the settings may return to the original values.
Table 3.1 Operation Parameters
Symbol Parameter Name Description and Setting
V(ST) Slot-Time
Indicates the time necessary for the immediate reply of the device.
Unitoftimeisinoctets(256µs).Setthemaximumspecicationfor
all devices. For this product, set a value of 4 or greater.
V(MID) Minimum-Inter-PDU- Delay
Indicates the minimum value of communication data intervals to
startreply.Unitoftimeisinoctets(256µs).Setthemaximum
specicationforalldevices.Forthisproduct,setavalueof4or
greater.
V(MRD) Maximum-Response-Delay
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specicationsforalldevices.Forthis
product,setV(MRD)xV(ST)toavalueof12orgreater.
V(FUN) First-Unpolled-Node
Indicates the address next to the address range used by the host.
Set 14 or more in hexadecimal notation.
V(NUN)
Number-of-consecutive-
Unpolled-Node
Unused address range. If a large value is set, it reduces the
communication load of the bus.
Not used
0x00
0xF7
0xF8
0x0F
0x10
0x13
0x14
0xFB
0xFC
0xFF
V(FUN)
V(FUN)+V(NUN)
LM device
Bridge device
Unused V(NUN)
Note 1: Bridge device: A linking device which brings data from one
or more H1 networks.
Note 2: LM device: with bus control function (Link Master function)
Note 3: BASIC device: without bus control function
BASIC device
Default address
Portable device address
F0302.EPS
Figure 3.2 Available Address Range
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