Flowserve MX-100 Field Unit - Manual (Page 15)

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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
01 Function 01 Function
00 Starting Address Hi 01 Byte Count
00 Starting Address Lo 18
1
Data (Coils 8 - 1)
00 No. of Points Hi 503A Error Check (CRC)
08 No. of Points Lo
3C2E Error Check (CRC)
Note 1: 18h equals 00011000 or coils 4 and 5 are ON.
2.3.4 Modbus Function Code 02 (Read Input Status)
This function code is used to read the discrete input status bits in the DDC-100 Field Unit. The use of this function
code will provide the user with the input status bits that are used to develop holding registers 9 through 13. The
status bit inputs are contained in locations 10129-10208 for each DDC-100 Field Unit and are defined in Table 2.3.
Table 2.3 – Status Bit Definitions
Bit Number
Modbus
Bit
Address
MX/DDC
129 128 Opened
130 129 Closed
131 130 Stopped in mid-travel
132 131 Opening
133 132 Closing
134 133 Valve jammed
135 134 Not in remote
136 135 Combined fault
137 136 Over-temperature fault
138 137 Actuator failing to de-energize
139 138 Channel A fault
140 139 Channel B fault
141 140 Open torque switch fault
142 141 Close torque switch fault
143 142 Valve operated manually fault
144 143 Phase error
145 144 Open inhibit active
146 145 Close inhibit active
147 146 Not used
148 147 Not used
149 148 One or more phases is missing
150 149 Reverse phase sequence is occurring
151 150 ESD conflict
152 151 Inhibit conflict
153 152 Use in local/stop (input must be set for CSE and enabled)
154 153 Not used
155 154 Network emergency shutdown (ESD) is active
156 155 Local emergency shutdown is active