Siemens SITRANS F M Intermag 2, Руководство по эксплуатации

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Operation
5-48
SITRANS FM Intermag 2 Flow Transmitter
Operating Manual - A5E00102775-03
The GSD lists all permissible identifiers for every measured value
(= module). They can be freely combined with the restriction that
only one identifier may be used per module and the order of the
identifiers must be the same as the order of modules.
At least one measured value must be requested, i.e. the number of
identifiers must be at least 1 and 4 at the most.
The formats ”resettable quantity” and ”quantity” are accepted for the
totalizer modules. The identifiers are checked independently of each
other, i.e. when polling several measured values, combinations with
different formats are permissible.
The order of measured values specified in the GSD is defined in the
cyclic telegram and cannot be changed (see also section
5.4.1 ). If
one of the four measured values is omitted, ”Free Place” must be
specified as an identifier.
Rules are stored in the GSD for use in the ”SIMATIC S7/HW-Config”
control system which prevent wrong configuration.
Example:
The measured values ”Totalizer net” and ”Totalizer forwards” should
be transmitted. Then the following identifier combination must be
specified:
1. Free Place (for flow)
2. long Identifier (for totalizer net)
3. long Identifier (for totalizer forwards)
No identifier for the totalizer reverse is necessary here because the
value of the totalizer forwards is the last measured value to be
transmitted.
5.4.2 Acyclic data traffic
Acyclic data transmission is mainly used for remote control of the
device, i.e. for transmitting parameters during commissioning,
maintenance, batch processes or for displaying other variables which
do not participate in the cyclic useful data traffic.
Acyclic accesses can be made by a class 1 master (C1 connection)
or a class 2 master (C2 connection). Sitrans FM supports up to four
simultaneous C2 connections.
The more than 300 parameters including address (Slot and Index),
format, value range, start value and attributes are stored in an object
list ”Obj80C4.rtf” which will be provided on request.
Acyclic operation takes place preferably with the SIMATIC PDM
software package and a PC (compatible with the industrial standard)
or programming device (see section 5.1).