Flintec DAD 141.1 - Manual (Page 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 comma nd 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 OK 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 OK 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 OK 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 OK Tare performed / Net operation
If the weight si gnal 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 OK Tare de-activated / Gross operation
The DAD 141.1 res ponds 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”.