<4. Configuration>
22
IM 01E21A02-03EN
z
Cable:
Used for connecting devices. Refer to “Fieldbus Technical Information” (TI 38K03A01-01E)
for details of instrumentation cabling. For field branch cabling, use terminal boards or a
connection box as required.
First, check the capacity of the power supply. The power supply capacity must be greater than
the sum of the maximum current consumed by all devices to be connected to Fieldbus. The
maximum current consumed (power supply voltage 9V to 32V) for this product is 15 mA.
The cable used for the spur must be of the minimum possible length.
4.2
Network Definition
Before connecting devices with Fieldbus, define the Fieldbus network. Allocate the PD tag and
node addresses to all devices (excluding such passive devices as terminators).
The PD tag is the same as the conventional one used for the device. Up to 32 alphanumeric
characters may be used for definition. Use a hyphen as a delimiter as required.
The node address is used to specify devices for communication purposes. Because this
data is too long for the PD Tag, the host uses the node address in place of the PD Tag for
communication. The range of 20 to 247 (or from 14 to F7 in hexadecimal notation) can be set.
The device (LM device) with bus control function (Link Master function) is allocated from a
smaller address number (20) side, and other devices (BASIC device) without bus control function
allocated from a larger address number (247) side respectively. Set the range of addresses to be
used to the LM device. Set the following parameters.
Table 4.1
Parameters for Setting Address Range
Symbol
Parameter Name
Description
V(FUN)
First-Unpolled-Node
Sets the address next to the address range used for the host or
other LM device.
V(NUN)
Number-of-consecutive-
Unpolled-Node
Unused address range.
