Interfaces
ZA5099-AS. The transmit and receive lines must be crossed once-only. Up to
32 other devices can then be wired in parallel with line lengths up to 1 km. As
with all networked devices each one must be set to a different device address;
(see 12.1).
The power supply also takes place with 12V DC over the bus.
11.2 Analog outputs
An analog output cable ZA 1601-RK (0 to 2 V ) can be connected at socket(s)
A2 and / or A1 (3) without electrical isolation; (see Manual 5.1.1). In ´Device
configuration´ the functions ´
ACH1
A2´ or ´
ACH2
A1´ should now appear (see
Chapter 12); here the reference channels for the corresponding analog outputs
and the scaling requirements can be entered.
Or, alternatively, there are variants 2490-xR02 with 2 integrated electrically iso-
lated analog outputs (see Section 15.2); these can be configured as 0 to 10 V,
0 to 20 mA, or 4 to 20 mA. These appear in ´Device configuration´ as ´
ACH6
PO´ and ´
ACH7
PO´ because they occupy ports 6 and 7 of socket P0 (2) (port
addresses 06 and 07). These two are connected to the evaluating unit via a
clamp connector as follows :
Which measuring channel is output via which analog output can be configured
via the display (see 12.2) or via the interface (see Manual 6.10.7). To achieve
the best possible resolution the partial measuring range used can be spread
over the full output range (0 to 10 V or 0/4 to 20 mA); (see 12.2).
On devices with option R02 (integrated analog outputs) and option
U (electrically isolated power supply) battery operation is no longer
possible.
ALMEMO
®
2450-1
23
