Switching Amplifier According To En 60947-5-6; Establishing Communication - Samson 3730-3 Mounting And Operating Instructions

Mounting and start-up
5.16.2 Switching amplifier
according to EN 60947-
5-6
For operation of the limit switches, switching
amplifiers must be connected in the output
circuit. They must comply with the limit val-
ues of the output circuits conforming to
EN 60947-5-6.
Î Observe the relevant regulations for in-
stallation 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.
86
5.16.3 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
col.
Viator FSK modem
− RS-232 Non-ex Order no. 8812-0130
− PCMCIA Non-ex Order no. 8812-0131
− USB Non-ex Order no. 8812-0132
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
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 way as for point-to-
point communication. This operating mode
is, for example suitable for split-range oper-
ation of positioners (series connection).
proto-
®
EB 8384-3 EN