Terminal
Data Description
Engineering Units
Measured Units
Acceptable Values
OC Output 1
Motor Rotation
1 Rotation per 12 VDC pulse (Closed Loop)
Pulse duration: 0.075 sec
12 VDC - Closed
0 VDC Open
0-80 RPM
OC Output 2
Motor Direction
Forward: Open Loop
Reverse: Closed Loop
12 VDC - Closed
0 VDC Open
OK, Open
OC Output 3
Modbus Communication
Status
OK: Open Loop
Fail: Closed Loop
12 VDC - Closed
0 VDC - Open
OK, Open
Wiring
Overview
The Modbus to Discrete converter connects and is powered by the GridBee controller via a serial cable connected to the
DB9 RS-232 serial port. The converter queries the controller and translates the data to the discrete outputs. The motor
RPM is also displayed on a two-digit display screen during normal operation and a visual status code when a fault exists.
Three discrete, open collector outputs are available at OC Outputs 1 through 3. OC Output 1 indicates a revolution of the
GridBee impeller. OC Output 2 indicates the direction of the GridBee impeller rotation. OC Output 3 indicates the success
of the last communication attempt between the Modbus Master module and digital controller (See the output definitions
below). The GridBee system status outputs will also indicate if there is a problem with one of the controller subsystems. If
a failure is indicated, please reference troubleshooting section of the GridBee O&M and call Ixom Watercare, Inc.
Customer Service at 866-437-8076 for troubleshooting assistance.
Output Definitions
Specifications
GridBee Modbus Master SCADA module
Number/Type of Discrete Outputs: 3/Open Collector,1 A at 12 VDC
Overall Dimensions
Length: 3.25 in (8.26 cm)
Width: 5.50 in (13.97 cm)
Depth: 1.35 in (3.43 cm)
Hole Dia.: 0.20 in at 5.0 in O.C.
Power Requirements
Input voltage: 4.5 VDC to 39 VDC
Max current: 0.55 A
Figure 2: Modbus Master Module
Figure 1: OC Output Wiring
OC Output (1-3)
V
BAT
/12 VDC
LOAD
TOP
BOTTOM
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Technical Data Sheet
GridBee Modbus to Discrete Converter
SCADA Accessory Package 6
2127_10398_20220113
O&M_GF5000PW_10307_20220121 - 45
