Bronkhorst EL-FLOW Base 2014 - Manual (Page 20)

BRONKHORST HIGH-TECH
Diagnostics (08)
The following sub-functions are supported:
Sub-function code (dec) Name
00 Return Query Data
10 Clear Counters and Diagnostics Register
11 Return Bus Message Count
12 Return Bus Communication Error Count
13 Return Bus Exception Error Count
14 Return Slave Message Count
15 Return Slave No Response Count
16 Return Slave NAK Count (always 0)
17 Return Slave Busy Count (always 0)
18 Return Bus Character Overrun Count
!
The maximum message size for the Return Query Data sub function is 100 bytes at 9600 baud (200
bytes at 19200 baud and 400 bytes at 38400 baud). When this size is exceeded, corrupted responses
may be received.
Possible exception responses:
• 01, ILLEGAL FUNCTION, in case of not-supported sub-function
• 03, ILLEGAL DATA VALUE, in case of an incorrect value for the data field
Report Slave ID (17)
The Slave ID field in the response is a string with the same contents as FlowDDE parameter 1 (indent
number + version nr/serial nr). The Run Indicator Status field in this message will indicate ON when the
device is in normal operating mode (FB_NORMAL).
Possible exception responses:
• 04, SLAVE DEVICE FAILURE, in case of an internal error
3.4.5 Available parameters
Modbus registers (in the data model) are numbered from 1 to 65536. In a Modbus PDU (Protocol Data
Unit) these registers are addressed from 0 to 65535.
The following table lists the most commonly used parameters.
MODBUS REGISTERS
PARAMETER NAME PARAMETER
TYPE
ACCESS PDU ADDRESS
hex
REGISTER NUMBER REMARK
Hex Dec
Wink Unsigned char W 0x0000 0x0001 1 Value 14592
Init/reset Unsigned char RW 0x000A 0x000B 11
Valve output Unsigned int RW 0x001F 0x0020 32 0..32767
Measure Unsigned int R 0x0020 0x0021 33
Setpoint Unsigned int RW 0x0021 0x0022 34
Setpoint slope Unsigned int RW 0x0022 0x0023 35
Analog input Unsigned int R 0x0023 0x0024 36
Setp. control modes Unsigned char RW 0x0024 0x0025 37
Sensor type Unsigned char RW  0x002E 0x002F 47
Capunit Unsigned char RW  0x002F 0x0030 48
Fluid number Unsigned char RW 0x0030 0x0031 49
Alarminfo Unsigned char R 0x0034 0x0035 53
Temperature Unsigned int R 0x0427 0x0428 1064
Identnumber Unsigned char RW  0x0E2C 0x0E2D 3629
ContrResp Unsigned char RW  0x0E45 0x0E46 3654
CycleTime Unsigned char R 0x0E4C 0x0E4D 3661
Page 20 EL-FLOW Base Series Mass Flow Controllers 9.17.061