7
4
20
mA
t
“1”
“0”
“1”
1200Hz 2200Hz 1200Hz
digital
data signal
analog
current signal
I
I +0,5mA
I -0.5mA
L+
L-
RD
BK
YE/GN
mA
FSK-Interface
240R
USB
Pt100
Pt100
YE
GN
GY
Pt-B2
Pt-B1
Pt-A1
L+
L-
RD
BK
YE/GN
mA
FSK-Interface
240R
USB
[email protected] | +49 (0) 8721/9668-0
ACS-CONTROL-SYSTEM GmbH | Lauterbachstr. 57 | 84307 Eggenfelden | Germany
4
Electrical connection
WARNING:
Install the device only in de-energized state.
NOTE:
For start-up deactivate all connected control devices, to avoid unwanted control reactions.
The device must be grounded, preferred by the metallic process connection, alternatively by the cable shield.
The optional field enclosure can be connected to earth by the connection screw PE/PA at the side of the enclosure.
Install cable separated from power leading cables, if existing connect shield to earth.
Cable: M12 – A-coded, 1-BN = brown / 2-WH = white / 3-BU = blue / 4-BK = black
4.1
Electronic output 09
-
A – 4…20mA, FSK interface
The digital communication protocol uses Frequency Shift Keying (FSK) technology and is superimposing onto the analogue
sensor signal 4…20mA. This allows a two-way-communication and thus allows the transmission of additional information’s,
that going above the normal process variables, from or to an intelligent field device.
The communication protocol communicates with 1.200 Bit/s without interrupting the 4…20mA signal an thus allows the host
application (master), to receive two or more digital actualizations per seconds from an intelligent field device. The digital
signal does not disturb the 4…20mA.
The communication protocol offers two simultaneous communication channels: the analogue 4…20mA signal and a digital
signal. The 4…20mA signal transmits the primary measuring value by the 4…20mA current loop, the fastest and most reliable
industry standard. The digital signal transmits additional information’s from the device like device state, diagnosis date,
additional measuring values or calculated values, etc.
The combination of both principles in one installation allows a cost effective and especially robust comprehensive field
communication solution, which can be simply uses and configured.
Use a cable 2-core, twisted, shielded.
Observe maximum permitted supply voltage Us at the terminals L+/L-:
•
Us = 9…35VDC
Observe maximum permitted load resistor RL of the analogue output:
•
RL ≤ (Us - 9V) / 22mA
Option electronic function 10-0
Connection current 4…20mA FSK
Option electronic function 10-0
Connection current 4…20mA FSK / Pt100 – 3-wire
Consider resistor 240
Ω
within wire +L for connection of the FSK-communication device.
3.4
Field enclosure
For connection of hydrostatic filling level sensors with reference air compensation an air pressure compensation element
is installed at the side of the field enclosure. This may not be damaged or polluted, otherwise this can lead to wrong
measurements of the filling level sensor and to the resulting dangers.
After installing the device check if all cable glands as well as the enclosure cover are tightly screwed.
