Siemens SIMATIC ET 200SP Manual page 134

Technical specifications
8.1 Programming reference
Program control variable
PWM operating mode
Duty cycle or
Target current (current control ena-
bled)
Period duration
On-delay
Pulse train operating mode
Number of pulses
Period duration
Duty cycle
134
Notes
Current control disabled:
PWM: OUTPUT_VALUE assigns the duty cycle (On/Off ratio) for the current period duration. You
select the range of the OUTPUT_VALUE control interface field with the "Output format" configura-
tion.
Output format "Per 100 (%)": Value range between 0 and 100
•
Pulse duration = (OUTPUT_VALUE/100) x period duration.
Output format "Per 1,000": Value range between 0 and 1,000
•
Pulse duration = (OUTPUT_VALUE/1,000) x period duration.
Output format "Per 10,000": Value range between 0 and 10,000
•
Pulse duration = (OUTPUT_VALUE/10,000) x period duration.
"S7 analog output" output format: Value range between 0 and 27,648
•
Pulse duration = (OUTPUT_VALUE/27,648) x period duration.
Current control enabled:
OUTPUT_VALUE assigns the target current as a ratio of target current/reference current. The
reference current value is used to define the maximum set point and the high and low limits of the
controlled current. Typically, the maximum current can be measured in PWM mode with current
control disabled and a duty cycle set to 100%. The value measured can be set as a reference for
the current control. The maximum value is 4000 mA for single channel operation (parallel channel
connection enabled) and 2000 mA per channel for dual channel operation (parallel connection
disabled).
The Period duration of an output PWM cycle. Assign the period duration value in μs with control
interface parameter SLOT, after setting up MODE_SLOT (0 or 1) and LD_SLOT = 1.
When you assign the period duration, take into account the minimum pulse duration configuration
and the response time of the control element connected to the DQ digital output.
The time from the start of the output sequence to the start of the DQ output pulse. Assign the On-
delay in μs with control interface parameter SLOT, after setting up MODE_SLOT (0 or 1) and
LD_SLOT = 2.
Number of pulses that are output at the DQ digital output on expiration of the On-delay. Your
control program can set the pulse count directly with the control interface parameter
(OUTPUT_VALUE). Set the number of pulses directly as a DWord number value between 0 to
4,294,967,295 (2 -1).
32
The Period duration of an output pulse cycle. Assign the period duration in μs with control inter-
face parameter SLOT, after setting up MODE_SLOT (0 or 1) and LD_SLOT = 1.
When you assign the period duration take into account the minimum pulse duration configuration
and the response time of the control element connected to the DQ digital output.
Assign the duty cycle with control interface parameter SLOT, after setting up MODE_SLOT (0 or
1) and LD_SLOT = 4. The range of the duty cycle parameter is selected using the "Output format"
configuration. If the number value you assign exceeds the upper limit, then a duty cycle of 100%
of the period duration is used and this action does not cause an error.
Output format "Per 100 (%)": Value range 0 to 100
•
Pulse duration = (duty cycle/100) x period duration.
Output format "Per 1000": Value range 0 to 1,000
•
Pulse duration = (duty cycle/1,000) x period duration.
Output format "Per 10000": Value range 0 to 10,000
•
Pulse duration = (duty cycle/10,000) x period duration.
Output format "S7 analog output": Value range 0 to 27,648
•
Pulse duration = (duty cycle/27,648) x period duration.
Technology module TM Pulse 2x24V (6ES7138‑6DB00‑0BB1)
Manual, 09/2015, A5E35061186-AA