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Super Capacitor
El super capacitor, llamado así porque tiene la habilidad de mantener una carga por un largo período de tiempo, protege los datos guardados en RAM durante las fallas de energía. La RAM dura típicamente 50 horas en el S7-221 y 222, y 72 horas en los S7-224 y 226.
El Modo de Puerto libre
El puerto de programación tiene un modo llamado modo de Puerto libre, el cual permite varios dispositivos inteligentes de sensores, tales como lectores de códigos de barras, par ser conectados
The tree main components of plcs are the input module, cpu
actuator module output module operator interface input device
2. A __________ _________ is used to input instructions to a PLC.
pushbutton switch
motor starter
power supply
programming device
3.
Prior to PLCs, many control tasks were solved with _________ - __________ controls.
hard-wired
actuator-sensor
progammable-logic
1. A switch or pushbutton is a __________ input.
analog
power
discrete
ROM
2. The _________ makes decisions and executes control instructions based on input signals.
CPU
I/O system
programming software
operator interface
3. A ________ consists of one or more instructions that accomplish a task.
data space
program
RAM
ROM
4. A ________ is not required when creating or changing a PLC program.
PLC
printer
programming device
programming software
1. The S7-200 Micro PLC is the _________ member of the SIMATIC S7 family.
largest
smallest
fastest
slowest
2. When the mode switch is in the _________ position, the programming device can select the operating mode.
RUN
TERM
STOP
LOAD
3. The CPU __________ indicators reflect the current mode of CPU operation.
input
output
status
terminal
4. A super capacitor protects data stored in __________.
ROM
RAM
EPROM
disk
1. ________ - _________ instructions allow for events to be processed before a PLC scan is complete.
high-speed
low-speed
status-function
special-function
2. Each rung, or _________, on a ladder logic diagram represents a logic operation.
function
operation
block
network
3. _________ is(are) used to override the input or output status of applications during testing.
pusbuttons
simulators
forcing
logic
1. A signal which has only two states is called discrete, or ________.
digital
analog
continuous
variable
2. A signal which varies continuously is called ________.
digital
analog
continuous
variable
3. A PLC cannot respond directly to signals in ________ form.
binary
digital
discrete
analog
4. A(n) _________ changes a signal to another form, depending on requirements.
inverter
transducer
module
pulser
1. The S7-200 supports _________ counters.
128
256
512
1,024
2. Three types of timers available in the S7-200 are On-Delay, Retentive On-Delay, and __________ -Delay.
Cumulative
Counter
On
Off
3. Three types of counters used in the S7-200 are the Up Counter, the Down Counter, and the ________ Counter.
Incremental
Reset
Up/Down
Up/Up
1. Events that require an action from the PLC before the scan cycle is complete are controlled by _________ - _________ instructions.
low-speed
interrupt-based
time-base
high-speed
2. The __________ function provides a fixed cycle time with a variable duty cycle.
PTO
PWM
AS-i
interrupt
3. _________ is an open bus standard which allows SIMATIC devices and devices from other manufacturers to communicate.
AS-i
PWM
PROFIBUS-DP
4. _________ is a system for networking binary devices such as sensors.
AS-i
PWM
PROFIBUS-DP
1. The PLC component that makes decisions and executes instructions is the __________.
programming device
CPU
operator interface
input module
2. One byte is ________ bits.
2
8
16
32
3. A continuously varying voltage input is an example of a(n) ________ input.
analog
discrete
high-speed
normally open
4. An input that is either On or Off is a(n) _________ input.
analog
discrete
high-speed
normally open
5. A programming language that uses symbols resembling those used in hard-wired control line diagrams is _________.
ladder logic
statement list
function block
network
6. A type of memory that can be read from but not written to is _________.
RAM
ROM
firmware
K memory
7. A _________ interface cable is needed when a personal computer is used as the programming device for an S7-200 PLC.
PC/PPI
parallel
serial
MPI
8. The CPU 224 AC/DC/RELAY has _________.
8 DC inputs and 10 relay outputs
8 AC inputs and 6 relay outputs
14 DC inputs and 14 relay outputs
14 DC inputs and 10 relay outputs
9.
_
_______ expansion modules can be used on the S7-224 and S7-226.
3
7
10
16
10.
The S7-222 has the ability to store _________ kbytes in user data.
2
4
6
8
11. Which of the following is not part of a PLC scan?
Force interrupts
Read Inputs
Update Outputs
Execute Instructions
12. The address designation for output 3 of an S7-200
is.
I0.4
I0.3
Q0.2
Q0.3
13. The maximum clock frequency for high-speed counters is _________.
5-10 kHz
10-15 kHz
10-30 kHz
20-50 kHz
14. The maximum value of an S7-200 timer with a resolution of 1 millisecond is
_________.
3.2767
32.767
327.67
3276.7
15. An S7-200 timer with a time base of 100 ms can count to a maximum value of ________ seconds.
3.2767
32.767
327.67
3276.7
16. The time base of TON 32 is ________ ms.
0.1
1
10
100
17. The maximum count of an S7-200 up counter is _________.
1024
32767
65534
131068
18. A(n) ________ is used to assign a mode to a high-speed
counter.
toggle switch
interrupt
time base
definition box
19. ________ instructions allow communication with external devices such a modems and printers.
Interrupt
Transmit
High-Speed
PWM
20. ________ is used to override input or output status when testing programs.
Transmit
Forcing
Interrupt
Scanning
