Flowserve MX-100 Field Unit - Manual (Page 27)

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MX/DDC-100 Field Unit Installation and Maintenance FCD LMENIM2329-01 – 03/11
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Message Breakdown
Query Response
03 Slave (Field Unit) Address 03 Slave (Field Unit) Address
08 Function 08 Function
00 Subfunction Hi 00 Subfunction Hi
00 Subfunction Lo 00 Subfunction Lo
00 Data Hi 00 Data Hi
00 Data Lo 00 Data Lo
E1E9 Error Check (CRC) E1E9 Error Check (CRC)
Table 2.7 – Diagnostic Codes Supported by the DDC-100 Field Unit
Code Name
00 Return Query Data
01 Restart Communication Option
02 Return Diagnostic Register 1
03 Change ASCII Input Delimiter
04 Force Listen-Only Mode
10 (0A Hex) Clear Counters and Diagnostics Register
11 (0B Hex) Return Bus Message Count
12 (0C Hex) Return Bus Communication Error Count
13 (0D Hex) Return Bus Exception Error Count
14 (0E Hex) Return Slave Message Count
Note 1: Contains DDC-100 Field Unit diagnostic information. For engineering use only.
2.3.10 Modbus Function Code 15 (Force Multiple Coils)
This function code allows the user to force multiple coils with a single command and uses the same coil assignments
as the function code 05.
It should be noted that the coils are operated from the lowest coil number to the highest. Forcing coil 1 or 2 OFF (0) is
considered a stop command, sending a 15 command to force two coils starting with coil 1, with coil 1 ON and coil 2
OFF, would result in the unit stopping, since coil 2 is forced OFF after coil 1 is forced ON.
To prevent inadvertent Stop commands from being issued, it is recommended to force one coil at a time.
Available digital outputs for DDC-100 Field Units are listed in Table 2.5. Force multiple coil commands should be
issued only once for the desired field unit control. Repeated issuance of an acknowledged command will degrade
network performance.
NOTE: This function code is implemented in UEC-3-DDC Modbus Firmware 2.00 and greater and MX-DDC Firmware
02/01.00 and greater
Example of force coil command
Force coil 1 of field unit 1 ON. This will CLOSE the valve controlled by field unit 1.
Query: 010F000000010101EF57
Response: 010F00000001940B