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09.95
3.1
Bus interface module
The SINEC H1 interface module CP231A is used to link the SINUMERIK 8X0 to a SINEC H1
bus system.
The figure "SINEC H1 interface module" shows the front view of the interface module with the
EPROM submodule, the programmer interface and the bus interface.
The firmware required for the interface module is stored on the EPROMs.
Testing and configuring functions can be executed locally with the PG 685 or PC AT via the
programmer interface.
The programmer interface conforms to the RS 232C/TTY standard, i.e. it can be used as RS
232C interface or TTY interface, as required. Its use is determined by the assignment of pins
in the connector of the connecting cable.
The hardware interface to the SINEC H1 bus is a 15-way subminiature connector which
accommodates the transceiver cable.
Data transmission between the interface module and the SINEC H1 bus is executed with a
transmission speed of 10 Mbit/sec.
The CP 231A module uses the ISO seven layer model. An outline configuration of the layer
model on the CP 231 is shown in figure "CP 231: interface module configuration".
Layer 1 to 2a consist of the physical components of the LAN and parts of the interface module
hardware.
Roughly, these are: the SINEC H1 bus cable, the transceivers and the interface module
hardware for the bus access method, in this case collision monitoring.
Layer 2b through 4 are implemented using a real-time operating system and a network
software.
The essential services are: addressing, blocking, error detection and flow control.
The SINEC AP 1.0 software package uses the network software interface and covers layer 5
through 7.
Note:
To ensure error-free data transfer between communications processor CP 231A and host
computer, the minimum time delay between two message frames, i.e. between AP acknow-
ledgement and AP request, should be approx. 30 - 50 ms.
AP request
(RNMPF...)
AP acknowledgement
CP231
(to RNMPF...)
AP request
(TNMPF...)
© Siemens AG 1989 All Rights Reserved
SINUMERIK 840/880 (PJ)
FLR
T
6FC5 197-0AB20-0BP0
3 Interface Modules
3.1 Bus interface module
3–5
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