Siemens AS 488/TM manual Central processing unit, Overview CPU, Monitoring, Cpu

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AS 488 in SIMATIC design

Central processing unit

■Overview CPU 486-3

The CPU 486-3 is equipped with an Intel 75-MHz Pentium pro- cessor. The performance is equivalent to the computing power of an AS 235 multiplied by a factor of 1.5.

The front of the robust, compact plastic housing contains:

•LEDs for status and fault displays

•Mode switch

•Slot for a memory card from which the system and application software is loaded into the main memory during startup

•2 slots for interface modules.

I & C monitoring

The IF 961-DIO interface module for digital input/output is used for I & C monitoring functions. It is inserted into the EXM 478-3 module in the CPU 486-3/488-3 of the AS 488 automation sys- tem. The IF 961-DIO module can be used to record I & C signals e.g. for:

•Door contact

•Overtemperature

•Monitoring of optical link module OLM

or to trigger a cabinet lamp or horn.

Line monitoring, e.g. to detect an open-circuit, is not possible.

The inputs and outputs have an electrically isolated design. The module electronics (ASIC) is protected against overvoltages by appropriate measures on the circuit.

The digital inputs comprise 8 channels arranged in groups of

4 x 2 channels. The current consumption is 8.4 mA with an input level of DC 24 V.

An input delay of 500 μs or 3 ms can be parameterized for all in- put channels together.

Possible cable lengths:

•Unscreened 200 m (with 500 μs) or 600 m (with 3 ms)

•Screened 1000 m.

The digital outputs also comprise 2 x 4 channels. The max. out- put current is 100 mA with DC 24 V. The outputs are protected against short-circuits by an electronic fuse.

A 25-contact Sub-D socket is used as the interface.

CPU 488-3 IF 962-COM serial interface module

The CPU 488-3 is equipped with an Intel 120-MHz Pentium pro- cessor. The performance of this CPU is approximately equiva- lent to the computing power of an AS 235 multiplied by a factor of 2.7 to 3. It is used as an alternative to the CPU 486-3, and is fully compatible with respect to hardware configuration, engi- neering and execution of the system and application software without further measures.

The front of the robust, compact plastic housing contains:

•LEDs for status and fault displays

•Mode switch

•Slot for a memory card from which the system and application software is loaded into the main memory during startup

•2 slots for interface modules.

Memory module (set with 2 x 8 Mbyte)

The CPUs 486-3 and 488-3 of the AS 488 automation system (and the CS-L2 bridge) are delivered with an integral main mem- ory (RAM). The memory module used as the main memory is a set of 2 x 8-Mbyte RAMs. A complete set must always be insert- ed. 4 Mbyte are available as the user memory.

The IF 962-COM interface module is required to connect a com- missioning terminal to an AS 488/TM automation system and to the CS-L2 bridge. The interface module is plugged into a pre- pared slot in the CPU 486-3/488-3.

■Ordering Data

	Order No.
CPU 486-3	6ES7 486-3AA00-0AB0
with 75 MHz Pentium processor,
2 slots for interface modules,
2 standard slots wide
CPU 488-3	6ES7 488-3AA00-0AB0
with 120 MHz Pentium processor,
2 slots for interface modules,
2 standard slots wide
IF 961-DIO interface module	6ES7 961-1AA00-0AC0
Digital input/output for I & C moni-
toring functions
IF 962-COM serial interface	6ES7 962-3AA00-0AC0
module
for commissioning terminal, with
two RS 232 interfaces

5/4 Siemens PLT 112 · 2002