Detcon X40-32-N7 - Manual (Page 38)

Model X40
Model X40 Instruction Manual Rev. 3.3 Page 32 of 64
4-20mA
Output
COMM
M
S
D
L
S
D
Output 4
Output 3
Output 1
Output 2
There are four
4-20mA outputs on
each AO-4 module.
mA
mA
mA
mA
_
_
_
_
4-20 mA Signal
Input
Control
System
4-20mA
Figure 32 Model AO-4 4-20mA Output Module
NOTE
The terminals on the AO-4 module are rated for a maximum of 30VDC. They are designed
to accept solid or stranded wire between 12AWG and 24AWG.
NOTE
External devices attached to the equipment must require a tool to access their wiring
terminals to prevent unauthorized access.
NOTE
Hazardous live voltages of external devices attached to the AO4 must be isolated or
disconnected prior to accessing the terminals of the external devices
NOTE
The cable penetration for the analog outputs must be made in the bottom of the enclosure
(See Figure 13). All penetrations must use a NEMA4 rated cable gland (Appleton p/n CG-
2575 or equivalent) to prevent water ingress and restrict access to the internal circuits of the
X40.
AO-4 modules provide a 4-20mA output equal to the current concentration reading reported to the
controller for the associated channel. These concentration readings are communicated by the controller to
the AO-4 modules using RS-485 Modbus™ RTU protocol. Therefore, each AO-4 module must have a
unique Modbus™ address. Modules are serially addressed in hex using the two rotary switches on the
module’s front panel labeled MSD (most significant digit) and LSD (least significant digit). AO-4 modules
must be connected to the RS-485 Master Port. The AO-4 modules must be addressed according to Table 2
AO-4 Modbus™ Addresses.
Table 2 AO-4 Modbus™ Addresses
Module Channel # Decimal Hex Module Channel # Decimal Hex
1
1
2
3
4
161 A1 5
17
18
19
20
165 A5
2
5
6
7
8
162 A2 6
21
22
23
24
166 A6
3
9
10
11
12
163 A3 7
25
26
27
28
167 A7