Ritron DATAFLOW RTU Series Uživatelská příručka stáhnout pdf (Strana 22)

Installation/Operation

( A-16 )

19. DIGITAL OUTPUTS

19.1 The two digital outputs are defined to be pins 1-3 and 2-4. These outputs are two dry-contact closure-

latching 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.

PARAMETER MINIMUM MAXIMUM

OPEN 1 MΩ

CLOSED 1 Ω

UL/ CSA POWER RATING 2A 30VDC

.5A 110VDC

.5A 125VAC

19.1.1 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 details on how to set these conditions, see the

DATAFLOW 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 that DATAFLOW RTU.

19.3 Because the relays are latching relays, they retain the state they are in if power to the DATAFLOW RTU

is lost; they will not go to OPEN state during power outage.

20.

ANALOG INPUTS

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 PJ101 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 DATAFLOW RTU.

20.1.1 If the signal to be read is a voltage source, the input pin is ready as is. The following table defines

the characteristics of the input pin working as voltage input. Absolute limits define the safe operating

region; operating outside this region can damage the device.

PARAMETER MINIMUM MAXIMUM

INPUT RANGE 0 V 5 V

SOURCE IMPEDANCE 1000 Ω

ABSOLUTE LIMITS -2 V 7 V

20.1.2 If the signal to be transmitted is a 0 - 20mA current source, the input pin must have a 250W resistor

placed 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.

See Figure A7, below, for an example of connecting a current loop sensor to the DATAFLOW RTU.

PARAMETER MINIMUM MAXIMUM

INPUT RANGE 0 mA 20 mA

SOURCE IMPEDANCE (Ev-5) / .02 Ω

ABSOLUTE LIMITS -8 mA 28 mA

NOTE: Ev is excitation voltage

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 62 63

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