Instruction manual

SITRANS TW
98 A5E00054075-05
Hardware functions
5. In current measurement (measuring range -12 to 100 mA), all input signals X
i
must be multiplied with the current shunt R
S
= R3 = 10 Ω. The characteristic input
values X
SKL,i
must be specified in the unit mV.
Example: (mA signal corresponds to physical height [m])
(X
SKL,1
= X
1
xR
S
= 10 mA x 10 Ω = 10 mA x 10 V/A = 100 mV)
When operating the device with SIMATIC PDM, the PDM-Device Description Rev. 2
of SITRANS TW is required. (SIMATIC PDM 5.2 already contains the PDM-DD
Rev. 2. An update for SIMATIC PDM 6.0 is available under
www.siemens.com/sitranst
(-> Support / -> Software Downloads).
3.7.5 Order
• Add the code S03 to the order number of the SITRANS TW or
• order as an accessory with order number 7NG3092-8AW
Sensor signal
X
i
-> X
SKL,i
(input values)
Linearized signal
Y
SKL,i
(input values)
X
1
: 10 mA -> X
SKL,1
:100mV
X
2
: 70 mA -> X
SKL,2
:700mV
X
n
: 80 mA -> X
SKL,n
:800mV
The input values X
SKL,i
must be entered in the
unit mV.
Y
SKL,1
:1**
Y
SKL,2
:5**
Y
SKL,n
:7**
** corresponds to [m]
NOTE
A special characteristic is used device-internally when the U/I input plug is used.
This overwrites an existing special characteristic in the device.