User Manual

56
Modbus
function code
Data item Data
03H 00A1H
Instrument specification flag
0000 0000 0000 0000
2
0
: Contact input 0: Not added, 1: Added
2
1
: Serial communication 0: Not added, 1: Added
2
2
: Heater burnout alarm 0: Not added, 1: Added
2
3
: Heater burnout alarm rating 0: 20A, 1: 50A
2
4
: Heater burnout alarm specification
0: Single phase 1: 3-phase
2
5
: Alarm 2 output 0: Not added, 1: Added
2
6
: Heating/Cooling control output
0: Not added, 1: Added
2
7
to 2
15
: Not used, always 0
Data
Note on setting and reading command
• The data (set value, decimal) is converted to hexadecimal figures.
A negative number is represented by 2's complement.
• When connecting plural slaves, the instrument numbers (addresses) must not be duplicated.
Setting command
• Setting range of each item is the same as that of key operation.
• When the data (set value) has a decimal point, a whole number (hexadecimal) without a decimal point is used.
• If the alarm type is changed during Alarm 1 type selection (0023H) and Alarm 2 type selection (0024H), the
Alarm value will revert to “0”. Also alarm output status will be initialized.
• It is possible to set the set value with the setting command of the communication function even when the set
value is locked.
• Although the options are not applied, setting the items for the options is possible using the setting command.
However, they will not function.
• The instrument numbers and communication speed of the slave cannot be set by communication function.
• When sending a command by broadcast address 0 (00H), the same command is sent to all the slaves
connected. However, the response is not returned.
• The memory can store up to 1,000,000 (one million) entries.
If the number of settings exceeds the limit, the data will not be saved. So frequent transmission via
communication is not recommended.
Reading command
• When the data (set value) has a decimal point, a whole number (hexadecimal) without a decimal point is
used for a response.
Negative acknowledgement
The slave will return Exception code 1 (01H) in the following cases.
• If control output OUT/OFF function (0037H) is selected after selecting Auto/Manual control function during
OUT/OFF key function selection.
• If Auto/Manual control (0038H) is selected after selecting control output OUT/OFF function during OUT/OFF
key function selection.
• When Manual control MV (0039H) is set during automatic control.
• When Auto-tuning/Auto-reset (0003H) is selected during PI action or ON/OFF action.
The slave will return Exception code 17 (11H) in the following cases.
• If “Cancel (0000H)” of Auto-tuning/Auto-reset (0003H) is selected while Auto-tuning/Auto-reset is being
cancelled.
• When “Perform (0001H)” of Auto-tuning/Auto-reset (0003H) is selected while Auto-tuning/Auto-reset is
performing.