Ametek DMS-3K, Installation & Operation Manual

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Modbus Alarms Data Mapping (Status)
Alarm ON/OFF Status is provided by reading 16-bit holding registers (Modbus Function 03) with
a single bit designated per input (or group of inputs) The Modbus Alarm data provides the On or
Off status for each input as configured. Every poll of our device will show the current status of
each Modbus register selected with a binary 1 for a specific bit position representing an input in
alarm and a binary 0 representing an input in the normal mode. This is not a representation of
the Field Contact Input status which can be set for N.O. or N.C. operation, but the true state of
each alarm input.(Alarm or Normal) The mapping of inputs to specific Modbus Addresses and
Bits is done via the WEB Browser Configuration pages.
Any Modbus bit position can contain any DMS-3K input number(s) so the mapping is performed
by the user. Multiple inputs can be grouped together for one common alarm for that Modbus
Register bit. The Modbus implementation also allows the transmitting or receiving of the
Annunciator Pushbutton Control functions.
When configuring the Modbus mapping, you can select Slave or Master Mode, your starting
register address from 40001 to 49990, how many Modbus Inputs you wish to transmit up to 128
(Eight 16 bit registers) and one extra 16 bit register for control pushbutton functions.
A sample Modbus Map shown below indicates the following:
Starting Modbus Register = 40001, 112 total Modbus Alarms (7 registers x 16 bits) and 8
Control Pushbuttons. Modbus Registers 40001-40005 show DMS-3K Input numbers in
sequential order, Register 40006 shows the Alarm Inputs continuing in reverse order and
Register 40007 shows a mixture of grouped inputs using a dash (-) or comma (,) to define the
group of inputs. Register 40008 is used for Control Pushbutton Inputs.
Modbus Register Address
Bit # 40001 40002 40003 40004 40005 40006 40007 40008
0 1 17 33 49 65 96 97,98 T1+
1 2 18 34 50 66 95 99,100 T1-
2 3 19 35 51 67 94 1-4 A1+
3 4 20 36 52 68 93 5-8 A1-
4 5 21 37 53 69 92 9-12 S1+
5 6 22 38 54 70 91 13-16 S1-
6 7 23 39 55 71 90 1-3,8,9 R1+
7 8 24 40 56 72 89 4-6,15 R1-
8 9 25 41 57 73 88 101
9 10 26 42 58 74 87 102
10 11 27 43 59 75 86 103
11 12 28 44 60 76 85 104
12 13 29 45 61 77 84 105
13 14 30 46 62 78 83 106
14 15 31 47 63 79 82 107
15 16 32 48 64 80 81 108