Siemens Welding System ST PCS 7 User Manual

PROFIBUS PA

Siemens ST PCS 7 · November 2007

9

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An active field distributor (AFD) can integrate up to 
4 PROFIBUS PA field devices via short-circuit proof spur line 
connections into a PROFIBUS PA ring with automatic bus termi-
nation. The PROFIBUS PA ring is connected to two FDC 157-0 
DP/PA couplers of a DP/PA router. Up to 8 AFDs and up to 
31 PROFIBUS PA devices can be configured per ring. The num-
ber of PROFIBUS PA devices is additionally limited by the max. 
current consumption of 1 A for all devices.

An AFD can be replaced during operation. The function of the 
PROFIBUS PA devices on the other AFDs is not influenced by 
this.

The active field splitter (AFS) connects a PROFIBUS PA line with 
two redundant FDC 157-0 DP/PA couplers of a DP/PA router. The 
AFS switches the PROFIBUS PA line to the active one of the two 
redundant couplers.

Up to 31 PROFIBUS PA devices can be connected on the 
PROFIBUS PA line. This number is additionally limited by the 
max. current consumption of 1 A for all devices.

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

Connection of PROFIBUS PA field 
devices

• Max. 4 per AFD

• Max. 31 per ring

• Operating environment up to 

zone 2 or 22

• Max. current consumption of all 

devices 1 A

Current Imax. per spur line X1 to X4

60 mA

Power supply

16 V DC (16 ... 32 V)

Current consumption

Approx. 20 mA

Power loss

Approx. 600 mW

Output voltage for PA section

31 V 

±

1 V  DC

Voltage failure bridging

5 ms

Output current for PA section (for 
dimensioning of device configura-
tion)

1 A

Diagnostic displays

Status PA main line PA1, PA2 
(green)
Fault PA main line PA1, PA2 (red)
Status/fault PA spur line X1 to X4 
(green)

Permissible operating temperature

-25 ... +70 °C

Dimensions (W x H x D) in mm

120 x 57 x 80

Weight

Approx. 700 g

Connection of PROFIBUS PA field 
devices

• Max. 31 per line

• Operating environment up to 

zone 2 or 22

• Max. current consumption of all 

devices 1 A

Power supply

16 V DC (16 ... 32 V)

Current consumption

Approx. 20 mA

Power loss

Approx. 600 mW

Output voltage for PA section

31 V 

±

1 V  DC

Voltage failure bridging

5 ms

Output current for PA section (for 
dimensioning of device configura-
tion)

1 A

Diagnostic displays

Status PA main line PA1, PA2 
(green)
Fault PA main line PA1, PA2 (red)

Permissible operating temperature

-25 ... +70 °C

Dimensions (W x H x D) in mm

120 x 57 x 80

Weight

Approx. 700 g

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Order No.

Active field distributor AFD
with 4 short-circuit-proof spur line 
connections for integration of field 
devices

B)

Active field splitter AFS
for connecting a PROFIBUS PA 
line to 2 redundant FDC 157-0 
DP/PA couplers; automatic 
switchover to the active coupler

B)

Profile rail adapter 
for an active field distributor AFD 
or active field splitter AFS, 
optional

© Siemens AG 2007