Analog Outputs 0 And 1 (Ano0&1); Contact Closure Inputs 0 And 1 (Cci0&1); Contact Closure Outputs 0 And 1 (Cco0&1); Signal Connections For Single Channel Analog Option (Ani8) - ABB ControlIT 53MC5000 Instruction Manual

53MC5000 Process Control Station
2.8.2 ANALOG OUTPUTS 0 AND 1 (AO0&1)
As shown on TB1 of Figure 2-24 , two current analog output signals (AO0 and AO1) are available
for transmission to remote analog indicating, recording, or process controlling devices. Each out-
put is independently selectable as a 0-20 mA or 4-20 mA signal. (Selections for the analog outputs
are provided in Section 5, Configuration Parameters.) Proper polarity must be observed when con-
necting the analog outputs to the remote device. Figure 2-29 contains a graphical illustration of
AO signal conditioning.
2.8.3 CONTACT CLOSURE INPUTS 0 AND 1 (DI0&1)
Two separate contact inputs are provided (DI0 and DI1) as event indicators that are used for sys-
tem sequencing and control purposes. For example, in Control Strategy 1, DI1 must be closed to
enable Remote Setpoint so that it can be selected with the R/L push button. As stated in Section
1, Specifications, the minimum open recognition duration is 0.05 seconds, and the minimum closed
recognition duration is also 0.05 seconds for a valid DI signal (open or closed condition) to the con-
troller. Reference Figure 2-24 for the TB1 screw lug assignments of the contact inputs. Figure 2-
29 contains a graphical illustration of DI signal conditioning.
2.8.4 CONTACT CLOSURE OUTPUTS 0 AND 1 (DO0&1)
Two separate contact outputs are provided (DO0 and DO1) as maintained solid state contacts
that are either on or off. The output of a DO does not vary proportionally to a process variable
change, for example, a DO may be used to turn on a constant speed pump. A DO may also be
used by a controller to indicate its status to another controller. As stated in Section 1, Specifica-
tions, a DO has a 30 V dc and 50 mA dc maximum voltage and current rating for resistive loads.
Transient suppression is required for reactive loads. An interposing relay, such as the Dual Relay
ITB, must be wired to the DO outputs for applications where the DO tolerances are exceeded. Ref-
erence Figure 2-24 for TB1 DO screw lug assignments and for Dual Relay ITB wire connections to
TB1 when used in conjunction with the DO outputs. Additional information for DO applications is
provided in Appendix A, Discrete Contact Outputs. Figure 2-29 contains a graphical illustration of
DO signal conditioning.
2.9 SIGNAL CONNECTIONS FOR SINGLE CHANNEL ANALOG
OPTION (AI8)
The Single Channel Analog Option adds Analog Input 8 (AI8) to the controller. AI8 is dedicated to
isolated inputs and requires either a Single or a Multiple Channel Analog Input Card with an Isola-
tion Module installed on it. The Input Card is not an ITB, but comes installed on the Expan-
sion Board inside the controller . As shown in Figure 2-30, signal wires are connected to AI8 at
TB3 of the controller. Since TB3 is not on the same side of the controller backpanel as the stand-
ard rear terminal board or the cord set connector board, its position and screw lug assignments re-
main constant for both of these controller configurations.
Both, the Single and Multiple Channel Analog Input Cards have open thermocouple detection and
indication that is jumper selectable. The factory setting for jumper W1 (B-C position) causes a hot-
hot (upscale) indication if the thermocouple fails. The alternate setting for jumper W1 (A-B posi-
tion) causes a cold-cold (downscale) indication if the thermocouple fails. WARNING: If the
jumper position of W1 must be changed, then all of the safety precautions stated in Section
18, Maintenance and Parts List, must be adhered to, as this requires opening the controller
case to gain access to the Input Card. (See Figures 18-13 and 18-14 for the location of W1
on the option card.)
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