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8.8.7
Precautions
This section describes the precautions regarding the submaster function.
(1) Versions of the master/local module and GX Works2
Before using the submaster function, check the versions of the master/local module and GX Works2. (
546, Appendix 8)
All the master/local modules on a network where the submaster function is used must support the submaster
function.
(a) Connection of a local station that does not support the submaster function
A local station that does not support the submaster function can be connected with the following restrictions:
• Data in the master station (station number 0) area is not stored in the local station.
• While the master station is being disconnected with the submaster station operating as a master operating
station, transient transmission cannot be performed through the submaster station. Transient transmission
ends abnormally.
(b) Connection of a master station that does not support the submaster function with a
submaster station connected
Data link is started without detecting overlaps, such as the submaster station in use and different parameters,
in the submaster function.
(c) Executing the parameter process of a slave station from a submaster station using
GX Works2
Select "Operate with Parameter of Host Station" in the network settings. Configure the network configuration
settings in the CC IE Field configuration window.
When "Operate with Parameter of Master Station" is selected in the network settings, the parameter process of
a slave station cannot be executed from a submaster station.
(2) Number of submaster stations
Set only one submaster station on one network. If multiple submaster stations are set, an error occurs in the
submaster station. If a submaster station is added to a network with a submaster station connected, an error
occurs only in the added submaster station.
(3) Functions that can be used
Functions that can be used only in the master station cannot be used in a submaster operating station.
(
Page 36, Section 3.3)
The following are examples of the functions that can be used only in the master station:
• Stopping and restarting cyclic transmission performed for other stations
• Temporarily enabling/disabling a reserved station
• Enabling/canceling a temporary error invalid station
• Setting a station number for a station that does not have a station number
(4) Output of a slave station
When the switch is performed between the master station and the submaster station, the output of a slave station
is held.
CHAPTER 8 FUNCTIONS
Page
203
8
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