User's Manual

Siemens PLT 111 · 1999
4/4
I/O modules
Summary
I/O modules from other systems
I/O modules from other systems can be operated on the I/O bus
of an AS 235 automation system via existing parallel and serial
links (see Section 7).
The following modules can be connected:
• SIMATIC S5-115U digital and analog input/output modules, fit-
ted in ER 701-1 and ER 701-2 expansion racks
• SIMATIC S5-135U/155U digital and analog input/output mod-
ules, fitted in EU 183U, EU 184U and EU 187U expansion units
• Digital and analog input/output modules of the ET 100U elec-
tronic terminator
The respective interface module for the coupling occupies one
I/O slot.
These modules are addressed via the driver blocks for analog
and binary input/output which are present as standard in the
AS 235 automation system. The analog drivers are equipped
with special, parameterizable operating modes for SIMATIC S5
modules. Limit monitoring functions in the driver software are
used for measured-value monitoring functions which are miss-
ing on the SIMATIC S5 modules or which operate with limits
other than those common in the TELEPERM M system.
Communication between TELEPERM M and SIMATIC S5/S7
automation systems is possible using the coupling module
6DS1 333-8AB (page 7/8) and the 3964 R/RK 512 procedure.
Selection criteria for I/O modules
There are various criteria for selecting the most suitable I/O mod-
ules for a particular application; these criteria must be evaluated
depending on the respective application. The selection of either
TELEPERM M or SIMATIC S5 modules is made easier for the
planning engineer by the following decision criteria:
• Preprocessing on the module
Only signal modules from the SIMATIC S5 range without pre-
processing (non-intelligent) can be used.
• 230 V peripherals
In contrast to TELEPERM M, the range of SIMATIC S5 modules
also contains input/output modules for signals up to 230 V.
• Backup response
In the event of a fault in the automation system, a fault in the
coupling, or faults in the expansion unit, SIMATIC modules
always enter the safety status (0 V, 0 mA), whereas the plan-
ning engineer can select for the TELEPERM M output modules
whether the last value is to be retained or whether the safety
value is to be output.
• Transmitter and measuring range monitoring
The monitoring functions for measuring range limits which are
not present in the SIMATIC S5 modules to the same extent as
in the TELEPERM M modules are implemented in the special
operating modes of the driver blocks in the automation system
so that they are also available when using SIMATIC S5 mod-
ules.
Power supply, earthing
The different earthing concepts of the two systems must be
observed when using TELEPERM M automation systems and
SIMATIC S5 expansion units together. An automation system is
always part of a so-called "0-V island" which is earthed via a sin-
gle connection to the central earthing point (with the central 24-V
supply). In the SIMATIC S5 expansion unit, the
M potential of
each module is directly connected to the frame and via this to
the local earth.
In the case of coupling between TELEPERM M automation sys-
tems and SIMATIC S5 expansion units, it must be ensured that
the screen of the connection cable does not destroy the earthing
concept of TELEPERM M. Isolating power supply units must be
used in the expansion unit, or DC 24 V/DC 24 V converters with
electrical isolation must be provided if necessary.
Lightning protection with distributed configuration
The use of SIMATIC S5 modules in distributed, serially-coupled
EU expansion units makes it possible to protect the transmission
lines using appropriate overvoltage arresters.
This catalog is out of date, see note on page 1