Siemens ST PCS 7 manual Communication, Active field distributor AFD and active field splitter AFS

© Siemens AG 2007

Communication

PROFIBUS PA

Active field distributor AFD and active field splitter AFS

■Overview

Active field distributor AFD and active field splitter AFS

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

Active field distributor AFD

An active field distributor (AFD) can integrate up to

4PROFIBUS 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

31PROFIBUS 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.

Connection of PROFIBUS PA field devices

Power supply

Current consumption

Power loss

Output voltage for PA section

Voltage failure bridging

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

Diagnostic displays

•Max. 31 per line

•Operating environment up to zone 2 or 22

•Max. current consumption of all devices 1 A

16 V DC (16 ... 32 V)

Approx. 20 mA

Approx. 600 mW

31 V ± 1 V DC

5ms

1A

Status PA main line PA1, PA2 (green)

Fault PA main line PA1, PA2 (red)

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

Active field distributor AFD and active field splitter AFS

	Permissible operating temperature	-25 ... +70 °C
	Dimensions (W x H x D) in mm	120 x 57 x 80		9
	Weight	Approx. 700 g
■Selection and Ordering Data		Order No.
Active field distributor AFD		6ES7 157-0AF81-0XA0	B)
with 4 short-circuit-proof spur line
connections for integration of field
devices
	Active field splitter AFS	6ES7 157-0AF82-0XA0	B)
	for connecting a PROFIBUS PA
	line to 2 redundant FDC 157-0
	DP/PA couplers; automatic
	switchover to the active coupler
	Profile rail adapter	6ES7 157-0AF83-0XA0
	for an active field distributor AFD

Active field distributor AFD

Connection of PROFIBUS PA field devices

Current Imax. per spur line X1 to X4

Power supply

Current consumption

Power loss

Output voltage for PA section

Voltage failure bridging

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

•Max. 4 per AFD

•Max. 31 per ring

•Operating environment up to zone 2 or 22

•Max. current consumption of all devices 1 A

60 mA

16 V DC (16 ... 32 V)

Approx. 20 mA

Approx. 600 mW 31 V ± 1 V DC

5ms

1A

or active field splitter AFS,

optional

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

Siemens ST PCS 7 · November 2007

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