A-3
Modbus TCP
AC30V series Variable Speed Drive
STRINGS
Strings parameters have a parameter number that represents the whole string. This parameter number is mapped to two registers so limits
access to the first four characters. Additional contiguous parameter numbers are set aside so that the whole string can be accessed: one
additional parameter number for each four characters. The strings are packed into the registers
low byte first
.
String Example
A string parameter called
My String
has a string length of 12 characters (plus the null terminator). This will have one parameter number allocated
for the whole string (in this example 161) and 3 further parameter numbers for the string fragments (162-164).
If the value of the string is “0123456789AB”:
Parameter
Number
Represents
Register
Number
Register Value
hi-byte
lo-byte
0161
whole string
“0123456789AB”
00849
‘1’
‘0’
00850
‘3’
‘2’
0162
Fragment
“0123”
00851
‘1’
‘0’
00852
‘3’
‘2’
0163
fragment
“4567”
00853
‘5’
‘4’
00854
‘7’
‘6’
0164
fragment
“89AB”
00855
‘9’
‘8’
00856
‘B’
‘A’
Note: This is an example parameter.
As each AC30V parameter maps to two registers, if the registers that represent the whole string are accessed then only the first four characters
will appear. To access the whole string over Modbus use the registers that map to the parameter number of the whole array plus one, in this
example
0162
(register
00851
). A multiple read or write of registers will then provide access to the whole string.
Summary of Contents for AC30V Series
Page 34: ...Installation 4 16 AC30V series Variable Speed Drive Basic Speed Control Wiring...
Page 35: ...4 17 Installation AC30V series Variable Speed Drive APPLICATION 1 AUTO MANUAL CONTROL...
Page 36: ...Installation 4 18 AC30V series Variable Speed Drive Auto Manual Control Wiring...
Page 37: ...4 19 Installation AC30V series Variable Speed Drive APPLICATION 2 RAISE LOWER TRIM...
Page 38: ...Installation 4 20 AC30V series Variable Speed Drive Raise Lower Trim Wiring...
Page 39: ...4 21 Installation AC30V series Variable Speed Drive APPLICATION 3 PRESETS SPEEDS...
Page 40: ...Installation 4 22 AC30V series Variable Speed Drive Presets Speeds Wiring...
Page 41: ...4 23 Installation AC30V series Variable Speed Drive APPLICATION 4 PID CONTROL...
Page 42: ...Installation 4 24 AC30V series Variable Speed Drive PID Control Wiring...
Page 162: ...Sequencing Logic B 2 AC30V series Variable Speed Drive SEQUENCING DIAGRAM...
Page 325: ...E 2 E Plan Library AC30V series Variable Speed Drive Which then brings up the E Plan page...