User's Manual

Communication
PROFIBUS PA
Active field distributor AFD
and active field splitter AFS
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Siemens ST PCS 7 · November 2007
9
■ Overview
Active field distributor AFD
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.
Active field splitter AFS
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.
■ Technical specifications
B) Subject to export regulations: AL: N, ECCN: EAR99H
Active field distributor AFD and active field splitter AFS
Active field distributor AFD
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 ± 1V DC
Voltage failure bridging
5 ms
Output current for PA section (for
dimensioning of device configura-
tion)
1A
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
Active field splitter AFS
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 ± 1V DC
Voltage failure bridging
5 ms
Output current for PA section (for
dimensioning of device configura-
tion)
1A
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
■ Selection and Ordering Data Order No.
Active field distributor AFD
with 4 short-circuit-proof spur line
connections for integration of field
devices
6ES7 157-0AF81-0XA0 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
6ES7 157-0AF82-0XA0 B)
Profile rail adapter
for an active field distributor AFD
or active field splitter AFS,
optional
6ES7 157-0AF83-0XA0
Active field distributor AFD and active field splitter AFS
© Siemens AG 2007