sauter EQJW145, Operating Manual

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EQJW145: Heating controller
Communication functions
7010015003 A
75
© Fr. Sauter AG
Coil no. Description Comment Can be
set?
Can be
deleted?
0 1
159 Timeout BMS BMS monitoring yes yes INACTIV
E
ACTIVE
Tab. 8: Modbus data points coils
When a function of the controller is specified via Modbus (e.g. status of the
UP output), the associated level bit (as it is called, designated as EBN) is
deleted on the controller. The controller no longer controls the respective
function itself in this case. When Modbus communication has finished (e.g.
modem link disconnected), these level bits are set again after a timeout
period of 30 minutes (unless this timeout function was disabled in CP27).
From then on, the controller resumes control of all functions.
6.4 Modem operation
A modem of type KT DataMod10 can be connected to the communication
interface. This modem can be used for Modbus communication with a control
station, or to send error messages via SMS. In both cases, the controller can
build up a connection automatically if a fault occurs.
The two functions can be combined. In this case, an error is signalled via
SMS and via Modbus.
6.4.1 Connection with the modem
A special connection line
5
(included in the scope of delivery for the modem) is
used to connect with the modem on terminals 18 to 21 of the controller base.
For this purpose, the end of the line is plugged into the controller base
terminals with the pins in such a way that the screws are visible. Then tighten
the four screws in question on the controller base.
6.4.2 Modbus operation via modem
CP02 must be set to 3 or 5. In Modbus mode, the controller accepts calls
from a control station to the modem. In the event of an error, the control
station is called on the telephone number entered at CP06.
In the case of a modem connection, before executing write commands via
Modbus, the valid code number (123) must be written to Modbus register
40145. Otherwise, only read commands will be processed. This is used to
prove the legitimation of the control system. If an incorrect code number is
entered three times via Modbus, this is recorded as a prohibited access
attempt. As a result, an error bit is set and the control station is dialled by the
controller.
5
The line between the controller and the modem must not be longer than 1.5 m for reasons related to EMC
Level bits