Computer Weld Technology Micro ADM, Operation & Installation Manual

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4.0 Micro ADM™ MODBUS MEMORY MAP
4.1 General Description
This document provides the basic ModBus memory map and command structure
for the Micro ADM™ RS-485 communications port. The Micro ADM™ supports
the ModBus Protocol as specified in the Modicon Technical publications
“ModBus Protocol” (intr7.html). The Micro ADM™ control does not support the
Broadcast mode. The controller provides the slave side communications routines
for the RTU mode. The user must define the Slave ID to a unique ID number
from 1 – 247. Default Baud rate is 19.2 K baud.
4.2 Supported ModBus Commands
The following ModBus commands are supported:
CODE DESCRIPTION ADDRESS RANGE
01 Read Coil Status 0-15
03 Read Holding Registers 0-26
05 Force Single Coil 0-15
06 Preset Single Register 0-26
15 Force Multiple Coils 0-15
16 Preset Multiple Registers 0-26
17 Report Slave ID 5 bytes
4.3 Memory Map for Sensor
The following is the Coil definitions address 0-15:
COIL ADDRESS DESCRIPTION
1 0 Arc Active – Set when Weld Arc is detected
2 1 Save Average Data – When set Weld Summary Data is stored
in NVRAM
3 2 Clear Summary Counter – When set the Average Data Counter
is reset to 0 and Average Memory is cleared
4 3 Clear Part Fault Counter – When set the Fault Counter will be
reset to 0
5 4 Enable Metric units of measure. When set the sensor use
metric units of measure. (Wire = mm/sec; Gas = kpa)
6 5 Enable Auto Arc Detect – When set the Arc On condition is
detected by sensing the arc voltage and arc current. When
cleared the sensor can be forced into an arc on condition by
asserting CR 1.
7 6 Read Memory – When set the Weld Summary data specified
by Register 19 will be read into Register 2-12. Coil will be reset
when summary has been loaded. Function is executed only
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