Switching Amplifier; Establishing Communication - Samson 3730-3 Mounting And Operating Instructions

Note:

In positioners for attachment accord-
ing to VDI/VDE 3847, the terminal
designation of the limit contacts
41/42 and 51/52 as well as the
OPEN and CLOSED wording can be
changed by turning the terminal la-
bel which is printed on both sides.
5.2.1

Switching amplifier

For operation of the limit contacts, switching
amplifiers must be connected in the output
circuit. To ensure the operating reliability of
the positioner, the amplifiers should comply
with the limit values of the output circuits
conforming to EN 60947-5-6.
Observe the relevant regulations for installa-
tion in hazardous areas.
For applications in safe areas (non-hazard-
ous areas), limit switches can be directly in-
terconnected to the binary input of the PLC in
accordance with IEC 61131. This applies to
the standard operating range for digital in-
puts according to Clause 5.2.1.2 of
IEC 61131-2 with the rated voltage of
24 V DC.
EB 8384-3 EN
5.2.1 Establishing communica-
tion
Communication between computer and posi-
tioner using an FSK modem or handheld
communicator (if necessary, using an isola-
tion amplifier) is based on the HART® proto-
col.
Viator FSK modem
− RS-232 No ex
− PCMCIA No ex
− USB No ex
If the load impedance of the controller or
control station is too low, an isolation ampli-
fier must be connected between controller
and positioner (interfacing as for positioner
Fig. 22 connected in hazardous areas).
If the positioner is used in hazardous areas,
an explosion-protected isolation amplifier
must to be used.
Using the HART protocol, all connected
®
control room and field units can be ad-
dressed individually using a point-to-point
connection or the standard (multidrop) bus.
Point-to-point:
The bus address/polling address must al-
ways be set to zero (0).
Standard bus (multidrop):
In the standard bus (multidrop) mode, the
positioner follows the analog current signal
(set point) in the same manner as for point-
to-point communication. This operating
Connections
Order no. 8812-0130
Order no. 8812-0131
Order no. 8812-0132
59