Flowserve Limitorque Master Station III - Manual (Page 41)

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Limitorque Master Station III FCD LMENIM5001-02 – 12/13
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8.2.5.3.1 Modbus FC 02 Read Input Status
Touching the “Modbus FC 02 Read Input Status” button will take the user to the FC 02 Read Input
Status Screen (Figure 8.23) for selection of desired input status bits from field unit holding registers
9-13. There are two ways of doing this: Standard and A/B Style. Standard style is a static mapping
of register status bits as seen in Table 8.1. A/B Style is a dynamic mapping of register status bits as
selected using the register tables based on Table 8.1. Choose the mapping style according to the
expatiation in Section 8.2.5 DCS Configuration.
Figure 8.23 - FC-02 Read Input Status
Selecting the “Next” button will advance the screen from registers 9 through 13.
In standard mapping mode the Function Code -02 mapping is a static mapping of the total input
table as shown in Table 8.1 per MOV. A total of 80 bits represent an individual MOV. 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. Only the enabled bits will be returned as valid data (otherwise, zeros). Address affect
is accounted for in MS III decoding process (i.e., 10,000). The A/B mapping style operates similarly
but with the exception that only enabled bits return data. So where the Standard Style returns all bits,
valid or not, A/B Style returns only the bits that are selected.
Table 8.1 - 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 in Stop Mode
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