Chapter 3 Operating the ETC II
Using the ETC II
18
ETC II Network Communicator
Historical records can be read in an arbitrary manner, or in a sequential
order. See the ETC II Modbus Guide for more information on retrieving log
files from your device.
Status Event Exchanges
The Data server logs binary events asserted by the connected devices and
gives notification to the eXpertPower server.
A binary event mask specifies critical event bits in the device status register.
Whenever the Data server detects a change in the status bits selected by
the event mask, it records an event record to the circular Event log file. If the
eXpertPower service is enabled in the ETC II, this event initiates a
connection to the eXpertPower server.
Polling status events is performed via the status event exchanges. The Data
server provides up to 250 event exchanges of 1 register long, with a
separate event mask.
The Data server provides the auto re-set option that may be used to clear a
latched device status register after it has been read. In most devices, critical
events are latched into a status register, so that the new events are not
generated until the register is explicitly cleared by a master application.
Since status registers may be implemented in the device either as coils, or
as holding registers, you should specify a register type for each event
exchange.
Write Data Exchanges
The Data server can provide remote writing data to serviced devices upon
user request. Up to 250 write exchanges are supported with a size of 1 to 12
registers.
The following table shows the write exchange layout.
Write Exchange Block
Description
Range
Exchange
number
0-249
Write flag
0
–
Data has been
written
1
–
Data is waiting
to be written
Data register 1
...
Data register 12
To send data to a device via a write exchange, write data to the write
exchange with the write flag being set to 1. The write flag is automatically
cleared after the data has been successfully transferred to the device.
Always check this flag before writing new data to the exchange to ensure it
is empty, otherwise previously written data may be lost.
Monitoring Digital Inputs
The Data server provides continuous monitoring events asserted by the
ET2002 digital inputs and gives notification to the eXpertPower server.
Whenever the Data server detects a change in the status of the ETC II
digital inputs, it records an event record to the Event log file. If the
eXpertPower service is enabled in the ETC II, this event initiates a
connection to the eXpertPower server.
eXpertPower
TM
Client
The ETC II has an embedded eXpertPower
TM
client that provides
communications with the eXpertPower
TM
server – the SATEC proprietary
Internet services.
