Siemens SIMATIC ET 200AL System Manual page 1254

DP/PA bus link for connection of PROFIBUS PA
The DP/PA bus link is the connection between PROFIBUS DP and PROFIBUS PA. This
means it connects the process control systems with the field devices of the process
automation.
The following components are available for a DP/PA bus link:
● DP/PA coupler Ex [ia]
● DP/PA coupler FDC 157-0
● Interface module IM 153-2 for establishing a DP/PA link.
● Active field distributor AFDiS for hazardous areas
Active components for the gateway between PROFIBUS and AS-Interface
● DP/AS-i LINK Advanced:
The DP/AS-i LINK Advanced is PROFIBUS DPV1 slave (according to
IEC 61158-2/EN 61158-2) and AS-Interface master (according to AS-Interface
specification V3.0 according to EN 50295) and provides transparent data access to
AS-Interface from PROFIBUS DP.
PROFIBUS DP masters can cyclically exchange I/O data with the AS-Interface;
DP masters with acyclic services can also make AS-Interface master calls. The DP/AS-i
LINK Advanced is particularly suited for distributed configurations and for the connection
of a subordinate AS-Interface network.
The DP/AS-i LINK Advanced in the version as AS-Interface single master is completely
sufficient for applications with typical configuration limits.
For applications with high configuration limits, the DP/AS-i LINK Advanced is used as
AS-Interface double master. In this case, the duplicate configuration limits can be used
on two independently running AS-Interface strands.
● DP/AS-Interface Link 20E:
The DP/AS-Interface Link 20E is PROFIBUS DP slave (in accordance with EN 61158)
and AS-Interface master (in accordance with AS-Interface specification V3.0 according to
EN 50295) and supports operation of the AS-Interface on PROFIBUS DP.
Single PROFIBUS masters can cyclically exchange I/O data with the AS-Interface;
masters with acyclic services can exchange I/O data and make master calls.
● DP/AS-i F-Link:
The DP/AS-i F-Link is PROFIBUS DP-V1 slave (according to EN 61158) and AS-i master
(according to AS-Interface specification V3.0 to EN 50295) and provides transparent data
access to AS-Interface from PROFIBUS DP. The DP/AS-i F-Link is also the only AS-i
master that can forward safety-oriented input data of ASIsafe slaves to a fail-safe CPU
with PROFIBUS DP master by means of the PROFIsafe protocol. Additional safety
cabling or monitoring is not required (in particular, no AS-Interface safety monitor).
Depending on the slave type, you can transmit binary values or analog values. All slaves
according to AS-Interface specification V2.0, V2.1 or V3.0 can be operated as AS-i
slaves.
As fully-featured AS-i master according to specification V3.0, you can use higher
configuration limits on the AS-i network (496 inputs and outputs each, up to 62 digital or
analog slaves).
PROFIBUS with STEP 7 V13
Function Manual, 12/2014, A5E03775446-AC
2.2 Structure of PROFIBUS networks
Description
31