Interference Immunity; Safety Shutdown - Siemens SIPART PS2 Operating Instructions Manual

5.1.1

Interference immunity

If the bus shield is fully effective, the interference immunity and the interference emission
conform to the specifications. The following measures ensure that the bus shield is fully
effective:
● The shields have been connected to the metallic connections of the positioner.
● The shields have been laid up to the terminal boxes, the distributor and the transceiver.
Note
Dissipation of glitch impulses/equipotential bonding
In order to dissipate glitch impulses, the positioner must be connected to an equipotential
bonding cable (earth potential) using a low resistance. The positioner in the polycarbonate
enclosure is therefore equipped with an additional cable. Connect the this cable to the shield
of the bus cable and the equipotential bonding cable using a cable clamp.
Devices in the stainless steel or aluminum enclosure have a corresponding terminal on the
outer side of the enclosure. This terminal must also be connected to the equipotential
bonding cable.
For applications in hazardous areas, ensure an adequately suitable equipotential bonding
between the hazardous and non-hazardous areas.
5.1.2

Safety shutdown

The positioner is equipped with an additional input (terminal 81 [+] and terminal 82 [-]) to
approach the safety position. After activating this function, this input must be continuously
supplied with +24 V in order to retain the normal control function.
If the 24-V signal is interrupted, the safety position is set as described in chapter "Basic safety
instructions for the pneumatic connection (Page 92)".
Communication with the master is still possible. The "Jumper" on the basic electronics is used
to activate this function. It can be accessed after removing the module cover, and must be
switched from the right position (delivery state) to the left position.
SIPART PS2 with PROFIBUS PA
Operating Instructions, 05/2019, A5E00127926-AC
Connect
5.1 Basic safety instructions
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