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24 - DP400S - User manual
9 Data logger
DP400S features a basic data logger function which can be enabled on
parameter 109
Data logger. After the initial start-up following the switch-on,
the device will start to save process data on EEPROM according to a selected
time basis. Sampling time must be selected on parameter 110
Datalogger
time . Stored data may be read via Modbus protocol starting from address 6001
(MSW) or 9001 (LSW) (see following section of this manual). The following table
provides info about the stored data:
6001(H) 6002 (L) Data logger: firmware version
6003(H) 6004 (L) Data logger: sensor type
6005(H) 6006 (L) Data logger: decimal point
6007(H)
6008 (L) Data logger: measure unit
6009(H) 6010 (L) Data logger: sampling time in seconds
6011(H) 6012 (L)
Data logger: flag end of memory. 0 indicates that
memory is still available. 1 indicates memory is saturated
and device restarted to store data from address
6033/6034
6033(H) 6034(L) First analog input value stored.
6035(H) 6036(L) Second analog input value stored.
... ... ...
8031(H) 8032(L) Last analog input value stored.
Reading of value 0x80000000 (-2147483648) stands for end of stored data:
eventual data which should be read afterwards are not valid.
10 Serial communication
DP400S is equipped with RS485, it can receive and broadcast data via serial
communication using MODBUS-RTU protocol. The device is configured as
a Slave. This function enables the control of multiple devices connected to a
supervisory system. Each controller responds to a master query only if the query
contains the same address as that in the parameter 126
Slave address
.
The permitted addresses range from 1 to 254 and there must not be controllers
with the same address on the same line.