Ladder Logic Elements and Instructions
870 USE 101 10 V.2 411
A Special STAT Instruction Overview A special version of the STAT instruction has been developed to support
Momentum M1 CPUs. The STAT instr uct ion ac cess es a sp ecif ied nu mber of wor ds
in a status table in the CPU’s system memory. Here vital diagnostic information
regarding the health of the CPU and the I/OBus I/O under its control is posted.
From the STAT instruction, you can copy some or all of the status words into a
block of registers or a block of contiguous discrete references.
This section describes the STAT instruction.
Avoid Discretes We recommend that you do not use discretes in t he STAT destination node
because of the excessive number required to contain status information.
Specify Length The copy to the STAT block always begins with the first word in the table up to the
last word of interest to you. For example, if the status table is 20 words long and
you are interested only in the statistics provided in word 11, you need to copy only
words 1...11 by specifying a
length
of 11 in the STAT instruction.
Diagram of STAT
Block The STAT block includes a top node (for destination) and a bottom node (for
length). The STAT block is represented in the following illustration.
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