Rtm (Runtime Meters) Instruction - Siemens S7-1200 System Manual

8.1.5

RTM (Runtime meters) instruction

Table 8- 13 RTM instruction
LAD / FBD SCL
RTM(NR:=_uint_in_,
Table 8- 14 Data types for the parameters
Parameter and type
NR IN
MODE IN
PV IN
RET_VAL OUT
CQ OUT
CV OUT
The CPU operates up to 10 runtime hour meters to track the runtime hours of critical control
subsystems. You must start the individual hour meters with one RTM execution for each
timer. All runtime hour meters are stopped when the CPU makes a run-to-stop transition.
You can also stop individual timers with RTM execution mode 2.
When a CPU makes a stop-to-run transition, you must restart the hour timers with one RTM
execution for each timer that is started. After a runtime meter value is greater than
2147483647 hours, counting stops and the "Overflow" error is sent. You must execute the
RTM instruction once for each timer to reset or modify the timer.
A CPU power failure or power cycle causes a power-down process that saves the current
runtime meter values in retentive memory. Upon CPU power-up, the stored runtime meter
values are reloaded to the timers and the previous runtime hour totals are not lost. The
runtime meters must be restarted to accumulate additional runtime.
S7-1200 Programmable controller
System Manual, 03/2014, A5E02486680-AG
MODE:=_byte_in_,
PV:=_dint_in_,
CQ=>_bool_out_,
CV=>_dint_out_);
Data type
UInt
Byte
DInt
Int
Bool
DInt
8.1 Date, time-of-day, and clock functions
Description
The RTM (Runtime Meters) instruction can set, start, stop, and
read the runtime hour meters in the CPU.
Description
Runtime meter number: (possible values: 0..9)
RTM Execution mode number:
0 = Fetch values (the status is then written to CQ and the
•
current value to CV)
1 = Start (at the last counter value)
•
2 = Stop
•
4 = Set (to the value specified in PV)
•
5 = Set (to the value specified in PV) and then start
•
6 = Set (to the value specified in PV) and then stop
•
7 = Save all RTM values in the CPU to the MC (Memory
•
Card)
Preset hours value for the specified runtime meter
Function result / error message
Runtime meter status (1 = running)
Current runtime hours value for the specified meter
Extended instructions
291