Flintec DAD 141.1 Manual do Utilizador descarregar pdf (Página 38)

DAD 141.1 Technical Manual, Rev. 2.2 - February 2014

Page 38 of 54

10.5. Taring and Zeroing Commands – SZ, RZ, ZN, ST, RT, TN, RW, TI

The following commands allow you to set and reset the zero and tare values. The zero set up during calibration

remains the ‘true zero’ but the new ‘current zero’ can be set up by using the SZ command. If the SZ command

is issued and accepted then all weight values will then be based on the new ‘current zero’. Please remember

that the zero value will be subject to the Zero tracking function if enabled. If the weight signal is not stable (as

defined by the ‘No motion’ range NR and the ‘No motion’ time NT) then both the set zero SZ and set tare ST

commands will be disabled. Also the Set Zero SZ command is not allowed if the new zero value required and

the ‘calibration zero’ differ by more than 2 % of the CM value (maximum allowable value).

See chapter 11 - Use in “Approved” applications.

10.5.1. SZ Set System Zero [ Index 0x2061 ]

This command sets a new “current zero” which is then the basis of all weight values until further updated by the

zero tracking function, another SZ command or the “reset zero” command RZ.

Master (PC / SPS) sends

Slave (DAD 141.1) responds

Meaning

SZ

Set zero performed

The SZ command will fail (DAD 141.1 responds with ERR) if the new “current zero” is more than 2% (of the CM

value) higher or lower than the “true zero” set during calibration. The SZ command will also fail if the weight

signal is not stable as defined by the No motion range (NR) and the No motion time (NT). If the weight signal is

“stable”, the response to the IS command (Device Status) will show the “signal stable” bit active and the SZ

command will be accepted (OK). If the “signal stable” bit is not active, the SZ command will be rejected and the

DAD 141.1 will respond with ERR (error).

10.5.2. RZ Reset Zero [ Index 0x2061 ]

This command cancels the SZ command and the zero reading reverts to that set by the CZ command during

calibration.

Master (PC / SPS) sends

Slave (DAD 141.1) responds

Meaning

RZ

Zero point CZ active

The DAD 141.1 responds to the RZ command with either OK or ERR. If OK is returned then the “zero action

performed” bit in the Device Status (IS) response will be set to “0”.

10.5.3. ZN Store Zero Value [ Index 0x2226 ]

This command allows to store the zero value non volatile @ power off of the DAD 141.1.

Permitted values are 0 (off) and 1 (on).

Master (PC / SPS) sends

Slave (DAD 141.1) responds

Meaning

ZN

Z:000

Zero @ power off: OFF

ZN_1

Setup: Zero @ power off: ON

10.5.4. ST Set Tare [ Index 0x2061 ]

This command will activate the net weighing function by storing the current weight value as a tare value.

The weight signal must be “stable” within the limits set by NR (No Motion Range) and NT (No Motion Time)

commands for the “signal stable” bit to be active and set tare command to be accepted.

Master (PC / SPS) sends

Slave (DAD 141.1) responds

Meaning

ST

Tare performed / Net operation

If the weight signal is “stable”, the response to the IS command (Device Status) will show the “signal stable” bit

active and the ST command will be accepted (OK). If the “signal stable” bit is not active, the ST command will

be rejected and the DAD 141.1 will respond with ERR (error).

10.5.5. RT Reset Tare [ Index 0x2061 ]

This command resets the tare and the weighing signal returns to gross mode.

Master (PC / SPS) sends

Slave (DAD 141.1) responds

Meaning

RT

Tare de-activated / Gross operation

The DAD 141.1 responds to the RT command with either OK or ERR. If OK is returned then the “tare active” bit

in the Device Status (IS) response will be set to “0”.

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