Chromalox 6050 User Manual

76
Force Single Coil (Function 05)
Writes a single binary value to the Specified Instrument
Bit address.
Table 35. Force Single Coil (Modbus Function 05)
QUERY
Function Address of Bit State to write
05 HI LO FF/00 00
RESPONSE
Function Address of Bit State written
05 HI LO FF/00 00
The address specifies the address of the bit to be writ-
ten to. The State to write is FF when the bit is to be SET
and 00 if the bit is to be RESET.
Note: The Response normally returns the same data
as the Query.
Pre-Set Single Register (Function 06)
Writes two bytes to a specified word address.
Table 36. Pre-Set Single Register (Modbus Function 06)
QUERY
Function Address of Word Value to write
06 HI LO HI LO
RESPONSE
Function Address of Word Value written
05 HI LO HI LO
Note: The Response normally returns the same data
as the Query.
Loopback Diagnostic Test (Function 08)
Table 37. Loopback Diagnostic Test
(Modbus Function 08)
QUERY
Function Diagnostic Code Value
08 HI=00 LO=00 HI LO
RESPONSE
Function Sub-Function Value
08 HI=00 LO=00 HI LO
Note: The Response normally returns the same data
as the Query.
Pre-Set Multiple Registers (Function 10 Hex)
Writes a consecutive word (two-byte) value to the
specified address range.
Table 38. Pre-Set Multiple Registers
(Modbus Function 10 Hex)
QUERY
Function 1st Word
Address
No. of
Words
No. of
Bytes
First Value
to Write
10 HI LO HI LO HI LO
RESPONSE
Function 1st Word Address Number of Words
10 HI LO HI LO
Note: The number of consecutive words that can be
written is limited to 1.
Exception Responses
When a QUERY is sent that the instrument cannot
interpret then an Exception RESPONSE is returned.
Possible exception responses are:
Table 39. Modbus Exception Responses
Exception
Code
Error
Condition Interpretation
00 Unused None
01 Illegal
function
Function number out of
range.
02 Illegal Data
Address
Write functions: Parameter
number out of range or not
supported. (for write func-
tions only).
Read Functions: Start
parameter does not exist or
end parameter greater than
65536.
03 Illegal Data
Value
Attempt to write invalid
data / required action not
executed.
The format of an exception response is:
RESPONSE
Function Exception Code
Original Function code
with its Most Signifi-
cant Bit (MSB) set.
as detailed above
Note: In the case of multiple exception codes for a
single QUERY the Exception code returned is the one
corresponding to the first parameter in error.

Chromalox 6050 Specifications

General

Brand	Chromalox
Model	6050
Category	Controller
Language	English