Data Exchange With The Central Controller - Siemens SIMATIC S5 Manual

2 Data Exchange with the Central
Controller
The module has a RAM area with a length of 2048 bytes which can be addressed by the central
controller. This area is divided into 64 x 32 bytes. The message length and therefore the address
area required by the module is 32 bytes.
The message number has the highest module address.
Example of use in SIMATIC S5:
If the module is coded for peripheral address PY 160, the message number must be written to
peripheral (I/O) byte PY 191. The information contained in the messages can be written to
peripheral bytes PY 160 to PY 190 or read from here.
The message number address cannot be read back.
If parameters are not assigned for a controller, i.e. the parameters are 0, actual values will
nevertheless be acquired for this channel and the digital outputs assigned, i.e. the outputs cannot
be used for other controllers.
If the data (integration values, self-tuning parameters etc.) are to be buffered when using the IP 244
controller module for temperature control, the following points should be noted:
IP244
C79000–B8576–C860–02

Data Exchange with the Central Controller

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