Micromod Micro-DCI: 53MC5000 Multi-Loop Process Controller Instruction Manual - Manual (Page 74)

2.10 SIGNAL CONNECTIONS FOR THE ITBS
In noisy locations, two-wire shielded signal cable should be used and the routing of signal cable
bundles close to power wires should be avoided.
Each wire lead should be stripped to expose 1/4 inch (6.4 mm) conductor. All wiring to the ITB
terminal board screw lugs is supplied by the customer.
2.10.1 SCADA ADAPTER SIGNAL CONNECTIONS
The SCADA (Supervisory Control and Data Acquisition) Adapter is an interface adapter for inter-
connecting the controller’s RS-485 communications link to RS-232 devices, such as a phone mo-
dem, radio modem, or computer RS-232 communications port. Figure 2-31 illustrates SCADA
Adapter connections and provides the summary tables to set mode switches 1-8 for correct Re-
quest-to-Send/Clear-to-Send delays, parity, and baud rate. As shown in Figure 2-31, the SCADA
Adapter is cabled from adapter J4 to the controller backpanel at Datalink output jack J11 for the
cord set connector board. For the standard rear terminal board, the SCADA Adapter is cabled to
J1 of a Comm ITB. Screw lugs 1-4 of TB1 on the Comm ITB are wired to the controller rear termi-
nal board TB1, screw lugs 19-22 (TB1-5 [shield] of the Comm ITB is connected to a controller back-
panel #6 screw). See Figure 2-8 for SCADA Adapter to standard rear terminal board cabling and
see Figure 2-32 for Comm ITB to controller wire connections.
2.10.2 ANALOG ITB SIGNAL CONNECTIONS
As shown in Figure 2-33, the Analog ITB adds the capability for optional analog input connections
4 through 7 (AI4-7) and analog output connections 2 and 3 (AO2&3) to the controller. AI4-7 can be
used for current, pulse (AI5-7), or frequency inputs. (See the Multichannel Analog I/O Option in
Section 1, Specifications.) If used as a frequency input, the appropriate AI 250 ohm resistor must
be replaced with a resistor calculated to produce 4 V peak-to-peak minimum signal at the AI - and
+ terminals. Also, if the frequency input waveform deviates more than
±
2% from a 50% duty cy-
cle, then additional signal amplitude is required as follows:
Required Amplitude =
|
2/5 (% Duty Cycle - 50)
|
+4
A waveform with a 50% duty cycle requires 4 V peak-to-peak.
A waveform with a 10% duty cycle requires 20 V peak-to-peak.
A waveform with a 90% duty cycle requires 20 V peak-to-peak.
The Analog ITB is cabled from ITB J4 to the controller options connector board J4 as shown in Fig-
ures 2-8 and 2-9.
A controller can have an Analog ITB or a HART ITB, but not both (see Sec-
tion 1.3, Model Number Breakdown, Analog I/O Option).
2.10.3 CORD SET ITB SIGNAL CONNECTIONS
The Cord Set ITB is a remote version of the standard rear terminal board with some exceptions: it
has voltage dropping resistors R3 and R4 for AI2 and AI3, and it has screw lugs on TB1 for the ca-
ble shields rather than #6 screws that are used on the controller backpanel. The Cord Set ITB
eliminates the necessity to rewire the rear terminal board every time the controller chassis is re-
moved and re-installed in the instrument panel. It also puts the standard complement of controller
field wired inputs and outputs in closer proximity to the other ITBs. Signal connections for the Cord
Set ITB are illustrated in Figure 2-34. The Cord Set ITB is cabled from ITB J3 to controller cord set
connector board J3 as shown in Figure 2-9.
Section 2. Installation
2-35