IM 01C25R03-01E
5-2
5. CONFIGURATION
(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. Place the EJX910A in
the range of the BASIC device. When the EJX910A is
used as Link Master, place the EJX910A in the range
of the LM device. Set the range of addresses to be used
to the LM device. Set 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
The devices within the address range written as
“Unused” in Figure 5.1 cannot be used on a 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 the
Fieldbus.
0xF7
0xF8
0xFB
0xFC
0xFF
V(FUN)
V(FUN)
V(NUN)
LM device
Unused
V(NUN)
BASIC device
Default address
Portable device address
F0501.EPS
Not used
0x00
0x0F
0x10
0x13
0x14
Bridge device
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 specifica-
tion of each device for details. Table 5.2 lists EJX910A
specification values.
Table 5.2
Operation Parameter Values of the EJX910A to
be Set to LM Devices
Indicates the time necessary
for immediate reply of the
device. Unit of time is in
octets (256
µ
s). Set
maximum specification for
all devices. For EJX910A,
set a value of 5 or greater.
T0502.EPS
Symbol
Parameters
Description and Settings
V (ST)
Slot-Time
V (MID) Minimum-Inter-PDU-
Delay
Minimum value of
communication data
intervals. Unit of time is in
octets (256
µ
s). Set the
maximum specification for
all devices. For EJX910A,
set a value of 4 or greater.
V (MRD) Maximum-Reply-Delay The worst case time
elapsed until a reply is
recorded. The unit is Slot-
time; set the value so that
V (MRD)
V (ST) is the
maximum value of the
specification for all
devices. For EJX910A, the
setting must be a value of
12 or greater.
5.3 Definition of Combining
Function Blocks
The input/output parameters for function blocks are
combined. As required, they can be combined with the
input of the control block. The setting is written to the
EJX910A link object. See “Block setting” in Section
5.6 for the details. It is also possible to read values
from the host at proper intervals instead of connecting
the EJX910A block output to other blocks.
The combined blocks need to be executed synchro-
nously with other blocks on the communications
schedule. In this case, change the EJX910A schedule
according to the following table. The values in the
table are factory-settings.
Table 5.3 Execution Schedule of the EJX Function Blocks
T0503.EPS
Index
Parameters
Setting (Enclosed is
factory-setting)
269
(SM)
MACROCYCLE_
DURATION
Cycle (MACROCYCLE)
period of control or
measurement. Unit is 1/32
ms. (16000 = 0.5 s)
276
(SM)
FB_START_ENTRY.1 AI1 block startup time.
Elapsed time from the start
of MACROCYCLE specified
in 1/32 ms. (0 = 0 s)
280 to
289
(SM)
FB_START_ENTRY.5
to
FB_START_ENTRY.14
Not used.
277
(SM)
FB_START_ENTRY.2 AI2 block startup time.
Elapsed time from the start
of MACROCYCLE specified
in 1/32ms.(8000=250ms)
278
(SM)
FB_START_ENTRY.3 AI3 block startup time.
Elapsed time from the start
of MACROCYCLE specified
in 1/32ms.(16000=500ms)
279
(SM)
FB_START_ENTRY.4 AI4 block startup time.
Elapsed time from the start
of MACROCYCLE specified
in 1/32ms. (24000=750ms)
