Siemens S7-300 Installation Manual page 225

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Memory bits are part of the CPU's Æ system memory. They store intermediate
results of calculations. They can be accessed in bit, byte, word or doubleword
units.
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Memory Cards are memory media for CPUs and CPs. They are implemented in the
form of Æ RAM or Æ FEPROM. An MC differs from an Æ Micro Memory Card only
in its dimensions (MC is approximately the size of a credit card).
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Micro Memory Cards are memory media for CPUs and CPs. Its smaller dimensions
form the only difference compared to the Æ Memory Card.
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Module parameters are values which can be used to control the response of the
module. A distinction is made between static and dynamic module parameters.
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This interface is capable of multipoint communication (MPI). It forms part of the
SIMATIC S7 PG interface. It enables multiple-node operation (PGs, text-based
displays, OPs) on one or several PLCs. Each node is identified by a unique
address (MPI address).
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Æ MPI
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One block can be called from another by means of a block call. Nesting depth is
defined as the number of simultaneously called Æ code blocks.
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The reference potential of the control and on-load power circuits for non-isolated
I/Os is electrically interconnected.
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Organization Blocks
S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
A5E00105492-03
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