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Device handbook SINEAX DM5000
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5.10 Analog outputs
Analog outputs are available for devices with corresponding I/O extensions only. See nameplate. Analog
outputs may be remote controlled.
Connection to an analog input card of a PLC or a
control system
The device is an isolated measurement device. The
module outputs are galvanically connected, but the
modules isolated from each other. To reduce the
influence of disturbances shielded a twisted-pair cables
should be used. The shield should be connected to earth
on both opposite ends. If there are potential differences
between the ends of the cable the shield should be
earthed on one side only to prevent from equalizing
currents.
Under all circumstances consider as well appropriate
remarks in the instruction manual of the system to
connect.
5.11 Modbus interface RS485
Via the optional Modbus interface measurement data may be provided for a superior system. However,
the Modbus interface cannot be used for device parameterization.
1) One ground connection only.
This is possibly made within the
master (PC).
Rt: Termination resistors: 120 Ω each
for long cables (> approx. 10 m)
Rs: Bus supply resistors,
390 Ω each
The signal wires (A, B) have to be twisted. GND (C/X) can be connected via a wire or via the cable screen.
In disturbed environments shielded cables must be used. Supply resistors (Rs) have to be present in bus
master (PC) interface. Stubs should be avoided when connecting the devices. A pure line network is ideal.
You may connect up to 32 Modbus devices to the bus. A proper operation requires that all devices
connected to the bus have equal communication settings (baud rate, transmission format) and unique
Modbus addresses.
The bus system is operated half duplex and may be extended to a maximum length of 1200 m without
repeater.