Momentum Modbus Plus 170 PNT Series Guia do Utilizador descarregar pdf (Página 343)

100

101

Ladder Logic Elements and Instructions

870 USE 101 00 V.2.2

331

A Special STAT Instruction

Overview

A special version of the STAT instruction has been developed to support

Momentum M1 CPUs. The STAT instruction accesses a specified number of words

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 the 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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