Mitsubishi Electric Melsec Q Series User Manual page 4

[Design Precautions]
When a stop error has occurred to the CPU module, the communication status varies depending on
the error time output mode setting of GX Works2 as shown below.
Set the communication status for when a stop error has occurred to the CPU module according to
the system specifications.
Note that, if the QJ71PB92V is mounted to a redundant system, it operates as described in (1) below
regardless of the setting.
(1) When "Error time output mode" is set to "Hold"
(a) Since the communication with the DP-Slave is continued, values at the time of the CPU
module stop error occurrence are held as the output data sent to the DP-Slave from the
QJ71PB92V.
(b) Input data received from DP-Slaves are updated into the buffer memory of the QJ71PB92V.
(2) When "Error time output mode" is set to "Clear"
(a) Communications with DP-Slaves are interrupted, and output data are not sent.
(b) Input data received from DP-Slaves are held in the buffer memory of the QJ71PB92V.
When the QJ71PB92V is mounted in a redundant system, set the watchdog timer for DP-Slaves so
that the calculation formula shown in Section 4.8 (5) is satisfied.
If the formula is not satisfied, a watchdog timer error occurs in DP-Slaves during system switching.
Do not install PROFIBUS cables together with the main circuit or power lines or bring them close to
each other.
Keep a distance of 100mm (3.94 inches) or more between them.
Failure to do so may result in malfunction due to noise.
A
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WARNING
CAUTION