TEKTROL TEK-B ATCH 7900B, Instruction Manual

Page: 17 / 35

Instruction Manual
Tek-Batch 7900B
www.tek-trol.com
Technology Solutions
15
5.1.2.5.2 Operation of RS-232 Serial Port with Printers
5.1.2.5.2.1 Transaction Printing
The user defines the items included in the printed document (Refer section SET DATA
OUTPUT, Select list). The transaction document can be started by either pressing the PRINT
key or closing the remote contact.
5.1.2.5.2.2 Data Logging
The user defines the items included in each data log (Refer SET PRINTER OUTPUT, Select list
section). The user can also select when (time of day) or how often (print interval) the data
log is to be made (see SET PRINTER OUTPUT, Configure section).
5.1.2.5.2.3 System Setup and Maintenance Report
The system setup and maintenance reports list all instrument setup parameters and usage
for the current instrument configuration. The audit trail information and a status report are
also printed. This report is initiated in the Test menu (Refer PRINT SYSTEM SETUP section).
5.1.2.6 RS-485 Serial Port (optional)
5.1.2.6.1 RS-485 Port Description
The RS-485 card utilizes Modbus RTU protocol to access various process parameters and
totalizers. The Relays can be controlled through Modbus. Additionally, action routines can be
executed.
For further information, contact the factory and request the RS-485 Protocol manual.
5.1.2.6.2 Operation of Serial Communication Port with PC
•
The Batcher's RS-485 channel supports several Modbus RTU commands.
•
Modbus RTU drivers are available from third-party sources for a variety of Man-Machine
Interface software for IBM-compatible PCs.
•
The user reads and writes the information from/to the RS-485 using the Modbus RTU
commands.
•
The Batcher responds to this information and command requests.
•
Process variables and totalizers are read in register pairs in floating-point format.
•
Time and date are read as a series of integer register values.
•
Alarms are individually read as coils. Action routines are initiated by writing to coils.
5.2 Batcher Operation
•
The Batcher mode is used to control the batches.
•
The relay operation is the main difference between Batch and Rate/Total modes.
•
The operator can "START" the unit through the front panel or a remote input in Batch mode.
The relays (RLY1 & RLY2) will energize and transfer electricity to a flow control device once
they are started (i.e., solenoid valve or pump).
•
The total accumulation will begin when the unit receives a signal from the flow sensor.
•
Relay 2 will be turned off when the Prewarn value (PRE 2) is reached (ideal for flow slow down).
Relay 1 will drop out and complete the Batch when the Batch amount (PRE 1) is reached.