IDEC High Performance Series - Manual (Page 571)

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3 Communication Service
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External Device Setup Manual
3 Communication Service
The Master is equipped with registers for changing the slave connection settings and for monitoring the online status of the slaves.
In addition, the slaves are equipped with a register that can be used to monitor the polling period of the master.
Online status indicates that the master and a slave are communicating normally, and offline status indicates that either the
master is not communicating with a slave or there is a problem with the communication.
3.1 Slave Registration Setting Register (LSD102 in the master)
This register can be used to change the slave connection settings. You can freely add and remove slaves using this master register. The
configuration of the register is given below.
Slaves whose corresponding bit is “1” are registered.
After power is applied or the screen data is downloaded, the slaves to be used are cleared in accordance with the connection settings
made using WindO/I-NV2 or WindO/I-NV3. To add or remove slaves, set their corresponding bits to 1 or 0 respectively.
3.2 Slave Online Data Register (LSD104 in the master)
This register can be used to monitor the online status of the slaves registered to the O/I Link. The configuration of the register is given
below.
Bits corresponding to online slaves are 1, and bits corresponding to offline slaves or slaves not selected for connection are 0.
If the values of the data for the slave registration setting and the slave online data register are not the same, either the regis-
tered slave does not exist, or there is some problem with the slave connection. Check the wiring and the settings.
3.3 O/I Link Polling Period Register (LSD101 in the slaves)
This register stores the value of the polling period from the master in 10 msec steps. Use it to provide an indication of the response
time from the master.
3.4 Slave Error information Register(LSD106 in the master)
When the communication error occurred between master and any slave, the bit of each slave turns on for one scan time.