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W. Baelz & Sohn GmbH & Co.
· Koepffstrasse 5 · 74076 Heilbronn · Germany ·
www.baelz.de Seite | Page
Motorized Rotary Actuator
baelz 375-E42
7. DIGITAL POSITIONER 7020A
7.1 Intended use
The digital positioner
baelz 7020A
controls the actuator according to the value of the control
signal: 0(2)-10 V, 0(4)-20 mA
To ensure use for the purpose intended, check that the above type identification corresponds
to the nameplate on the positioner before starting any activities. The technical specifications of
the positioner and the power supply requirements are the indicated on the name plate.
Any use other than the intended use stated above, use for different tasks, and operation
with other power sources than those permitted, is considered to be improper use. In case of
improper use, the operator shall be solely liable for the risk presented to persons and to the
device as well as to other property!
The intended use also comprises compliance with the accident prevention regulations and
the DIN VDE standards of the German Institute for Standardization and the Association for
Electrical, Electronic & Information Technologies. It also implies working in accordance with the
safety requirements when performing all activities described in these operating instructions,
under consideration of general technical rules and regulations.
7.2 Operational modes and operating options
For further information and additional functions, see baelz 7020 operating instructions.
7.2.1 Standard operation using DIP switches
The DIP switches can be used to carry out standard configurations and operations (see
section 7.4
When DIP switch 11 is set to 0, the 7020A is in the standard operational mode.
In standard mode, all DIP switches are active and the functions of the Baelz 7020A can be
individually adapted. Functions which are predefined and unalterable in standard mode are
described in section 6.1 of the baelz 7020 operating instructions.
7.2.2 Standard operation using Modbus VT100 or direct addressing
In standard mode, the Baelz 7020A can be operated using Modbus VT100. For this, a virtual
7020A display and a virtual 7020A keypad are transmitted to a user interface. Modbus direct
addressing, e.g. from a building automation system, enables access to status information and
allows operation and configuration. (See baelz 7020 operating instructions, Appendix A). The
settings given by the DIP switches remain active. Values which are only relevant in Modbus
mode can be adjusted in standard mode, but only take effect in Modbus mode.
7.2.3 Modbus mode
When DIP switch 11 is set to 1, the Baelz 7020A is in Modbus mode. In Modbus mode, the
7020A is at its most flexible and can be configured and operated using either a Modbus VT100
or Modbus direct addressing, for example in a building automation system. See separate
operating instructions "Baelz 7020 Digital Positioner - Operating Instructions for Modbus mode"
Tip:
