F 6221 (0625)
309
2 Application
The field of application of the F 6221 module is the operation with current transmitters (0/4 to
20 mA) which can be supplied via the intrinsically safe supply unit F 3325. For safety reasons,
the supply voltage of the transmitters is monitored.
The F 6221 module contains the measuring device. It can be used to measure up to eight sig-
nal inputs (I1 to I8). For monitoring the transmitter supply voltages, another eight signal inputs
(TC1 to TC8) are available. These signal inputs only monitor the switch-off limit and are not
available to the user program as measuring values.
The signal inputs "I" and "TC" are related to each other (I1 to TC1, I2 to TC2 etc.).
There are some wiring variants for different applications available, for which HIMA supplies the
corresponding cables.
2.1 Wiring variants
2.1.1 Permissible wiring variants with two-wire passive transmitters
*) according to the technical report, No. 70013102.4 (/.1/.2)
Table 1: Permissible wiring variants with two-wire passive transmitters
Only the wiring variants described in the data sheets for F 3325 and
F 6221 are permissible. All other ways of wiring are prohibited!
For the described wiring variants only the provided HIMA cables are
admissible.
HIMA
variants
Variants*) Description
A1 1 Mono supply, mono current measuring,
wiring via cable
B 1 Mono supply, mono current measuring,
wiring via terminal
C1 3 Mono supply, redundant current measuring,
wiring via cable
D 3 Mono supply, redundant current measuring,
wiring via terminal
Note The other TÜV variants described in the technical report are only for
theoretical considerations.
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