Digital Outpu1S - Ritron DATAFLOW RTU Technical Manual

19. DIGITAL OUTPUTS
The two digital outputs are defined to be pins 1-3 and 2-4. These outputs are two dry-contact closure-latching
19.1
relays. They are controlled by the DATAFLOW RTU software, and are either OPEN or CLOSED. The
following table defines the characteristics of the relay. The UL/ CSA power rating is the safe operating region.
Operation outside of this region can damage the device.
19.l.l The relays can be programmed to have both initial and fail-safe conditions. The initial condition forces the
relays to a desired state at power on of the device. The fail-safe condition forces the relays to a desired state if a
RF data link problem is detected. For de t ails on how to set these conditions, see the DAT AF LOW RTU
Software/Programmers Manual.
19.2 If a digital output is used for a warning indicator, it is not available to be mapped to the corresponding digital
input of the other unit. This means that if a digital output is used for a warning indicator, only one digital signal
may be sent to thatDATAFWW RTU.
Because the relays are latching relays, they retain the state they are in if powerto the DATAFLOW RTU is lost;
!9.3
they will not go to OPEN state during power outage.
ANALOG INPlJTS
20.
20.1 The (up to) six analog inputs are defined as pins 7, 8, 11, 13, 15 and 17. (NOTE: Pins 15 and 17 are inputs only
if PJJ0I and PJ102 are configured as inputs.)
These inputs can be of two types: voltage or current loop. These inputs are used to digitize the analog signal and
transmit it to another
If the signal to he read is a voltage source, the input pin is ready as is. The following table defines the
20. l.l
characteristics of the input pin w orking as voltage input. Absolute limits define the safe operating region;
operating outside this region can damage the device.
If the signal to be transmitted is a 0 - 20mA current source, the input pin must ha v e a 250 Q resistor placed
20.1.2
between the pin and GROUND. The following table defines the characteristics of the input pin working as a
current input. Absolute limits define the safe operating region. Operating outside this region can damage the
device.
Installation/ Operation
PARAMETER
OPEN
CLOSED
UU
CSA POWER RATI N G
PARAMETER
INPUT RANGE
SOURCE IMPEDANCE
ABSOLUTE LIMITS
www.TwoWayRadioEquipment.com | (800) 878-7829 | Sales@TwoWayRadioEquipment.com
DATAFLOW RTU.
MINIMUM
1 MQ
MINIMUM
ov
-2V
MAXIMUM
1Q
2A30VDC
.SA 110VDC
.SA 12SVAC
MAXIMUM
SV
1000Q
7V
( A-16)