Analog Outputs - Ahlborn ALMEMO 2490-2 Operating Instructions Manual

11. Outputs
9600 baud; this setting should not be altered.
As alternative option I is available with an integrated RS485 interface. Via 6-
pin ALMEMO ® clamp connector ZA1000-FSV these devices can be connected
directly either to network distributor ZA5099-NVL or to bus driver 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
isolated 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, Manual
6.10.7).
On devices with option R02 (integrated analog outputs) and option

U (electrically isolated power supply) battery operation is no longer
possible.
26 ALMEMO 2490
®