Siemens SIMATIC ET 200SP HA Notice De Service page 12

Ex-DQ 2x17.4 VDC/27mA
The intrinsic safety of the interconnection of I/O module, sensors and cabling must be
proven by calculating the safety-related characteristic values. These values are stated
in the respective Ex certificates or on the data sheet of the cable.
Table 1-1 Pin assignment of Ex-DQ 2x17.4VDC/27mA
Termi Assig Termi
nal nmen nal
t
1 DQ.0+ 2
3 DQ.0- 4
5 Res 6
*)
7 Res 8
Terminal 5: DQ.0+ with released parallel connection
*)
Equipping
• Check the I/O module for damage! You may only plug undamaged I/O modules
onto the BaseUnit.
• The coding element on the BaseUnit latches into place the first time that a I/O
module is plugged in. This prevents the insertion of a wrong module. This
mechanical coding may not be changed.
• When configuring the ET 200SP HA and the ET 200SP, you must observe the
permissible number of I/O modules (see the respective operating instructions).
WARNING
Permissible number of I/O modules
When configuring the ET 200SP HA and the ET 200SP, you must observe the rules
specified below for the maximum configuration and load of the Ex power modules.
Load on the Ex power modules
Ensure that the current consumption of the Ex I/O modules of an Ex module group
does not exceed the permissible output current of the Ex power module.
The maximum current requirement of the I/O module can be found in the technical
specifications.
Permissible output current of the Ex power module > ∑ I
the respective potential group
12
Assig Explanations
nmen
t
DQ.1+ • Terminals 1; 2
DQ.n+: Output signal, channel n (0;1)
DQ.1-
• Terminals 3; 4
Res
DQ.n-: Mass, channel n (0;1)
Res
• Terminals 5; 6; 7; 8
Res: Reserve
of all I/O modules of
max
Ex-DQ 2x17.4 VDC/27mA
A5E50373587-AB, 03/2023