6.4
Pin assignment of the RS-485 data cable extension
Note
Functional faults may occur with cable lengths greater than 2 m.
TDIXBS[
XFJ
CMBV
SPU
7(/%
7FSTPSHVOHTTQBOOVOH
344DIOJUUTUFMMF4*53"/4`$$
4*53"/4.94UFDLFS
%$7
7(/%
%$7
34,BCFMTDIJSN
34-FJUVOH#
34-FJUVOH"
Supply cable:
2 x cable cross-section of 0.75 mm
2
RS-485 cable:
2 cores and a shield
Impedance: 120 ohms
6.5
Connecting the supply voltage for SITRANS CC240 and MX300
Note
The device should only be connected to a 9 to 35 V DC supply voltage which satisfies the
requirements of safe extra low voltage (SELV) according to IEC/EN/DIN EN/UL 60950‑1.
The supply voltage must meet the NEC Class 2 or LPS requirement according to IEC/EN/DIN EN/
UL 60950-1.
Note
The supply voltage must be adapted to the input data of the device, see section "Technical data
(Page 71)".
If there are voltage peaks on the supply lines, use a protective device in the form of a varistor
(MOV) UMOV = Urated x 1.2 (BLITZDUCTOR BVT AVD 24 (918 422) or compatible).
Introduction
The SITRANS CC240 and SITRANS MX300 devices can be powered by a single power supply. It is
also permitted to use a single protective device for SITRANS CC240 and SITRANS MX300.
Connecting
6.5 Connecting the supply voltage for SITRANS CC240 and MX300
SITRANS CC240 and SITRANS MX300
48
Operating Instructions, 06/2021, A5E47280695-AB
