Precision Digital PD562 - Manual (Page 9)

Relay Outputs
RATINGS
Alarm1: 250 VAC @ 3 A or 30 VDC @ 3 A (resisitive load)
Alarm2, 3: 250 VAC @ 1 A or 30 VDC @ 1 A (resistive load)
ELECTRICAL NOISE A suppressor (snubber) should be connected to each
SUPPRESSION relay contact switching inductive loads, to prevent
disruption to the microprocessor's operation.
Recommended suppressor value: 0.1
μF/470 Ω,
250 VAC (PDX6901)
DEADBAND For alarm operations, 0-100% of full scale, user selectable
HIGH OR LOW User may program each relay for high or low trip point
ALARM
TIME DELAY 0 to 99 minutes 59 seconds alarm trip delay for each alarm
FAIL-SAFE Programmable
OPERATION Independent for each alarm relay
AUTO INITIALIZATION When power is applied to the meter, alarm relays will
reflect the state of the input to the meter except standby
alarms.
Digital Inputs
CONFIGURATION Two contacts, two operating modes
CONTACTS Normally open switches (external excitation note required)
or open collector transistor
OPEN CIRCUIT Approximately 5 VDC
VOLTAGE
LOGIC LEVELS LO = 0 to 0.8 VDC, HI = 4.7 to 28 VDC
OPERATION MODES Mode 1: Record and reset maximum and minimum display
values simultaneously. Mode 2: Record and reset maximum
and minimum display values independently.
Serial Communications
PROTOCOLS Modbus (ASCII, RTU), PC software
UNIT ADDRESS 1 to 99 (Max 31 units connected)
BAUD RATE 600, 1200, 2400, 4800, 9600, 19200 bps, user selectable
RESPONSE TIME 0 to 100 ms delay response time
10 ms increments user selectable
DATA 7 or 8 bit user selectable
PARITY None, even, or odd
Approvals
UL RECOGNIZED USA and Canada
Process Control Equipment
UL FILE NUMBER E244207
CE COMPLIANT
PD560 Series Nova Digital Process and Temperature Meter Instruction Manual
9