Table of Contents
Advertisement
7
PARAMETER SETTING
7 - 20
(1) Target station IP address
(a)
Set the IP address of the target slave device.
(b)
When the target slave device is on another Ethernet and an access is to be
made via a router, set the router relay function of the basic parameter to "1:
Used" and set the routing information of the basic parameter.
Refer to Section 7.2 for the routing information.
(c)
Set the value that satisfies the following conditions.
Condition 1: The IP address class is any of A, B and C.
Condition 2: The host address bits are not all "0" or all "1".
(2) Module ID
(a)
Set the module ID when specifying the slave connected to the other line,
such as a line using the MODBUS Serial protocol.
(b)
The module ID is embedded into a request message to be sent to a target
slave device.
Refer to Section 4.2 for the frame specifications of the request message.
(3) Repeat interval timer value
(a)
The repeat interval timer value represents the time from when the
QJ71MT91 receives a response message from the slave until it sends a
next message to the slave.
(b)
Overlap of send and receive processings may cause delay and take more
time than the interval time set to the repeat interval timer.
(c)
The initial value is "0".
When the repeat interval timer value is "0", the QJ71MT91 will issue a next
request message immediately after it has received a response message
from the slave.
If unable to do so, check the time until that the slave station can process
the next request message. After that, set the above time or more of a value
to the repeat interval timer value.
(d)
The accuracy of the repeat interval timer is "0 to -10ms".
(4) Response monitoring timer value
(a)
The response monitoring timer value represents the time from when the
QJ71MT91 issues a request message to the slave until it receives a
response message from the slave.
(b)
If the QJ71MT91 does not receive a response message from the slave
before the response monitoring timer expires, it judges the target slave as
faulty.
When an error status occurs, the corresponding automatic communication
operation status storage area in the buffer memory turns on in the
QJ71MT91.
Also, the error code is stored in the automatic communication error code
storage area.
Refer to Section 11.3.1 for details of the automatic communication
operation status storage area and automatic communication error code
storage area.
(c)
When the response monitoring timer value is "0", the QJ71MT91 operates
at "60" (30s).
MELSEC-Q
7 - 20
Advertisement
Table of Contents
