8.2
MS-2102
Chapter 8 Communications
This command can access only the variable registers with
Memory Location Index between 0 (the first index in
Module Setup Group) and 164 (the last index in Heater
Statistics Group). Any attempts to read a variable register
with Memory Location Index beyond the above range
results in an error response in return.
Master Query: It consists of module address, function
code, memory location index of the starting variable
register, number of variable registers to be read and CRC
error check.
Slave Response: It consists of module address, function
code, quantity of data bytes to be returned, data value and
CRC error check.
Message Format and Example:
Request slave 11 to respond with local heater #1’s low
current alarm level. Suppose heater #1’s low temperature
alarm level is 10.1 °C. Here are transmission and
response messages:
Function code 05 - Reset Heater Alarms & Statistics
Modbus implementation: Force Single Coil
MS-2102 implementation: Reset heater alarms &
statistics
In Modbus, Force Single Coil forces logic coil to a state
of ON or OFF.
For the MS-2102 implementation of Modbus, this function
resets the heater alarm or statistics. Once an MS-2102
control module is in use, it keeps monitoring heater alarms
and updating heater statistics. Some of the alarms are
latched even after the alarm condition no longer exists.
It’s up to the user to reset those latched alarms and some
statistics. By sending a data value 65280 (FF00 Hex) to
any variable register with Memory Location Index be-
tween 165 and 186 (Heater Alarm Reset & Statistics Reset
Group), the corresponding alarm or statistics will be reset.
Sending a data value 0 to any register within the above
range is legal but will have no effect. Sending a data value
other than 65280 and 0 to any register within the range or
sending any data to any register beyond the range is
illegal and will result in an error response in return.
Master Query: It consists of module address, function
code, memory location index of the variable register, data
value FF00 Hex and CRC error check.
Slave Response: It consists of module address, function
code, memory location index of the variable register, data
value FF00 Hex and CRC error check.
Message Format and Example:
Request slave 200 to reset local heater #10’s minimum
temperature. Here are transmission and response
messages:
Function code 06 - Store a Value into one Variable
Register
Modbus implementation: Preset Single Register
MS-2102 implementation: Store a value into one variable
register
In Modbus, Preset Single Register places a specific binary
value into a holding register. For the MS-2102
mplementation of Modbus, this function is used to store a
value into one variable register with Memory Location
Index in Module Setup Group (0 to 30), Module Setting
Group (31 to 43) and Heater Setpoints Group (71 to 108).
Any attempts to store a value into a variable register
beyond the above range results in an error response.
Master Query: It consists of module address, function
code, memory location index of the variable register, data
value and CRC error check.
Slave Response: It consists of module address, function
code, memory location index of the variable register, data
value and CRC error check.
Message Format and Example:
Request slave 98 to change its local heater #10’s heater
setpoint to 30 °C. Here are transmission and response
messages:
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Содержание MASTERTRACE MS-2102
Страница 1: ...MASTERTRACE MS 2102 OPERATOR S MANUAL HEAT TRACING CONTROL ...
Страница 10: ...MS 2102 1 7 Chapter 1 Product Overview Figure 1 5 Hardware Block Diagram ...
Страница 12: ...2 2 MS 2102 Chapter 2 Installation Figure 2 2 Power Board Layout Figure 2 1 Main Board Layout ...
Страница 22: ...4 2 MS 2102 Chapter 4 Front Panel Operation Figure 4 1 Display Front View Figure 4 2 Contrast Control ...
