Siemens SINUMERIK 840C Installation Instructions Manual page 558

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Input of address of memory location to be monitored via the variable message function.

This machine data is operative only if the signal number is set to 0 (see MD 1621).

Input of threshold for the memory location address entered in machine data "Address variable

message function" (MD 1622) to be monitored via the variable message function. In

conjunction with machine data "Hysteresis variable message function" (MD 1624), this

machine data defines the actual value to be checked by the monitoring function (see diagram

under MD 1620).

Depending on the setting of bit 2 in machine data "Bits variable message function" (MD 1620,

the numerical value entered in MD 1623 is interpreted either as an unsigned value (bit 2 = 0)

or a signed value (bit 2 = 1).

Input of hysteresis (tolerance band) for the memory location address entered in machine data

"Address variable message function" (MD 1622) which is to be monitored by the variable

message function. In conjunction with machine data "Threshold variable message function"

(MD 1623), this machine data defines the actual value to be checked by the monitoring

function (see diagram under MD 1620).

Regardless of the setting of bit 2 in machine data "Bits variable message function" (MD 1620),

the numerical value entered in MD 1624 is interpreted either as an unsigned value (bit 2 = 0)

or a signed value (bit 2 = 1).

SINUMERIK 840C (IA)

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Address variable message function

Default value

Lower input limit

Threshold variable message function

Default value

Lower input limit

Hysteresis variable message function

Default value

Lower input limit

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7 Drive Machine Data (SIMODRIVE Drive MD)

Upper input limit

Upper input limit

Upper input limit

6FC5197- AA50

7.3.2 Drive MD (data description)

Simodrive 611-d