Yokogawa EJA115 - Manual (Page 20)

IM 01C22T02-01E 4-2
4. GETTING STARTED
4.2 Host Setting
To activate Fieldbus, the following settings are
required for the host.
IMPORTANT
Do not turn off the power immediately after
setting. When the parameters are saved to the
EEPROM, the redundant processing is executed
for an improvement of reliability. If the power is
turned off within 60 seconds after setting is
made, the modified parameters are not saved
and the settings may return to the original
values.
Table 4.1 Operation Parameters
T0401.EPS
Symbol Parameter Description and Settings
Minimum value of
communication data
intervals. Unit of time is in
octets (256
µ
s). Set the
maximum specification for
all devices. For EJA, set a
value of 4 or greater.
Indicates the time
necessary for immediate
reply of thje device. Unit of
time is in octets (256
µ
s).
Set maximum specification
for all devices. For EJA,
set a value of 4 or greater.
Slot-Time V (ST)
First-Unpolled-Node
Minimum-Inter-PDU-
Delay
Maximum-Reply-
Delay
Unused address range.
Indicate the address next
to the address range used
by the host. Set 0x15 or
greater.
Number-of-
consecutive-
Unpolled-Node
The worst case time
elapsed until a reply is
recorded. The unit is Slot-
time; set the value so that
V (MRD)
ϫ V (ST) is the
maximum value of the
specification for all
devices. For EJA, the
setting must be a value of
12 or greater.
V (MRD)
V (MID)
V (FUN)
V (NUN)
Not used
0x00
0xF7
0xF8
0x0F
0x10
0x13
0x14
0xFB
0xFC
0xFF
V(FUN)
V(FUN) ϩ 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
F0402.EPS
Figure 4.2 Available Address Range