Siemens Welding System ST PCS 7 User Manual

ET 200iSP distributed I/O

Siemens ST PCS 7 · November 2007

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ET 200iSP power supply unit is the designation for the combina-

tion of one (standard) or two redundant power supply modules 

PS with the matching terminal module:
• Standard: TM-PS-A terminal module
• Redundancy: TM-PS-B terminal module (additionally)
Power supply modules and terminal modules must each be or-

dered separately.
Functions of the power supply modules
• They provide the ET 200iSP with the safely isolated operating 

voltages for 

- logic (via the backplane bus),

- PROFIBUS DP interface (IM 152-1),

- power bus (for powering the electronics modules).

• They handle the safety-related limitation of the output voltage.
• They have a pressurized metal enclosure (explosion protec-

tion EEx d).

• They can be operated in redundant mode.

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Depending on the operating mode (standard or redundant), one 

or two power supply modules are plugged onto the correspond-

ing terminal modules. Hot swapping is also possible in the haz-

ardous area.
The operating status of the power supply modules is displayed 

on two LEDs on the IM 152 interface module (one for each mod-

ule).
The 24 V DC supply for the station is provided via EX e terminals 

on the terminal module of the power supply unit. This connection 

must not be removed in the hazardous area. The feeding power 

supply must be installed in the non-hazardous area.
The ET 200iSP must be terminated on the right-hand side (fol-

lowing the last electronics module) by a terminating module. The 

terminating module is included in the scope of delivery of the 

IM 152.

B) Subject to export regulations: AL: N, ECCN: EAR99H

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Order No.

for standard operation

B)

for redundant operation

B)

© Siemens AG 2007