Yokogawa RotaMASS 3-Series - Manual (Page 26)

5. CONFIGUrATION
5-2 IM 01R04B05-00E-E 3rd edition July 30, 2010 -00 all Rights Reserved. Copyright © 2005, Rota Yokogawa
node addresses are used to locate devices for
communication purposes. Since a PD tag is too
long for a data value, the host substitutes the
node addressed for PD tags in communication.
node addresses can be set to numbers in a range
of decimal 16 to 247 (hexadecimal 10 to F7). as-
sign devices having link master functionality (i.e.,
LM devices) from the smallest address number
(0x10) in order, and other devices (i.e., basic de-
vices) from the largest (0xF7). assign an address
in the range for basic devices to a RotaMaSS.
only when using a RotaMaSS with the optional
LM functionality as an LM device, assign an ad-
dress in the range for LM devices to it. these
address ranges are determined by the following
parameters.
Table 5.1 Parameters for Setting Address
range
t0501.EPS
V (Fun) First-unpolled-node Indicates 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
Symbol Parameters Description
any devices within an address range written as
“unused” in Figure 5.1 cannot join the fieldbus.
other address ranges are periodically scanned to
find any devices newly joining the fieldbus. Do
not widen the available address ranges unneces-
sarily; the fieldbus communication performance
may be severely degraded.
Bridge device
unused
0x10
0x0F
0x00
0x14
0x13
0xF7
0xF8
0xFB
0xFC
0xFF
V(Fun)
V(Fun)+V(nun)
LM devices
unused V(nun)
Basic devices
Default addresses
Portable device addresses
F0501.EPS
Figure 5.1 Available range of Node Addresses
to ensure stable operation of Fieldbus, determine
the operation parameters and set them to the LM
devices. While the parameters in table 5.2 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 specification of each device for
details. table 5.2 lists RotaMaSS specification
values.
Table 5.2 Operation Parameter Values of
rOTAMASS to be Set to LM device
Indicates the time
necessary for immediate
reply of the device. Unit of
time is in octets (256 µs).
Set maximum specification
for all devices. For a
Rotamass, set a value of 4
or greater.
T0502.EPS
S ymbol P arameters D escription and S ettings
V (ST) Slot-Time
V (MID) Minimum-Inter-PDU-
Delay
Minimum value of
communication data
intervals. Unit of time is in
octets (256 µs). Set the
maximum specification for
all devices. For a
Rotamass, set a value of 4
or greater.
V (MRD) Maximum-Response-
Delay
The worst case time
elapsed until a reply is
recorded. The unit is Slot-
time; set the value so that
V (MRD) 3V (ST) is the
maximum value of the
specification for all devices.
For a Rotamass, value of
V(MRD)3V (ST) must be 12
or greater.
5.3 Function Block Link
definitions
Link the input/output parameters of function blocks
to each other as necessary. For a RotaMaSS,
the output parameters of six aI blocks (outs),
two integrator blocks and input/output parameters
of an optional PID block should be linked to pa-
rameters of different function blocks. Specifically,
link settings must be written to the link object in
the RotaMaSS For details, refer to Section 5.6,
“Block Setting.” It is also possible to read values
from the host at appropriate intervals instead
of linking the outputs of RotaMaSS’s function
blocks to other blocks.
the linked blocks need to be executed synchro-
nously with other blocks and the communication
schedule. In this case, change the schedule of
the RotaMaSS according to table 5.3, in which
factory settings are shown in parentheses.