
Configuring an M1 CPU with Modsoft
870USE10110 July 2004 185
Establishing Configuration Extension Memory for M1 CPUs with Modsoft
Introduction By default, no memory space is allocated for configuration extension memory. If you
want to use the Peer Cop capability to handle Modbus Plus communications, you
need to define some configuration extension memory to enable Peer Cop.
Extension memory is specified as a number of 16-bit words. That number is entered
in the ExtSize entry of the Configuration editor. Once an adequate number of words
has been specified here, Peer Cop will be enabled in the CfgExt pull-down list.
How Much
Memory?
The minimum Peer Cop ExtSize memory requirement is 20 words; the maximum is
1366 words.
Follow these guidelines for estimating the amount of extension memory you will
need for your Peer Cop database:
Procedure From the Configuration Overview screen, follow the steps below to establish
configuration extension memory:
For... Add... Up to a maximum
of ...
Overhead 9 words --
Global output 5 words --
Global input number of words= number of devices x
(1 + 2 x number of device subentries)
1088 words
Specific output 2 words for every device entry in Peer Cop 128 words
Specific input 2 words for every device entry in Peer Cop 128 words
Step Action
1 From the Cfg Ext menu, select Cfg. Extension Size.
Result: The cursor will appear in the Cfg. Extension Used/Size entry.
2 Type the desired size.
3 Push <Enter>.
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