Siemens MICROMASTER 420 - Page 60

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MICROMASTER 420 Reference Manual
52 Issue A1
3.3.7 Task telegram (Master → MICROMASTER 420)
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The first word of the PZD task telegram is the inverter control word (STW).
Provided that the inverter is being controlled over USS, (see parameter
P0700), the control word has the following meaning:
Table 3-5 Inverter Control Word (STW)
Bit 00 "On (Ramp-up) / OFF1 (Ramp-down)". 0 NO 1 YES
Bit 01 "OFF2: electrical stop". 0 YES 1 NO
Bit 02 "OFF3: Fast stop". 0 YES 1 NO
Bit 03 "Pulse enable". 0 NO 1 YES
Bit 04 "RFG enable". 0 NO 1 YES
Bit 05 "RFG start". 0 NO 1 YES
Bit 06 "Setpoint enable". 0 NO 1 YES
Bit 07 "Fault acknowledge". 0 NO 1 YES
Bit 08 "Jog right". 0 NO 1 YES
Bit 09 "Jog left". 0 NO 1 YES
Bit 10 "Control from PLC". 0 NO 1 YES
Bit 11 "Setpoint inversion. 0 NO 1 YES
Bit 12 Not assigned.
Bit 13 "Motorpoti raise". 0 NO 1 YES
Bit 14 "Motorpoti lower". 0 NO 1 YES
Bit 15 Local / Remote. 0 P0719 ind 0 1 P0719 ind 1
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Bit 10 must be set to 1 for the control word to be accepted by the inverter.
If bit 10 is 0, the control word will be ignored and the inverter will continue
to operate as it was before.
•
The local / remote function using Bit 15 is not possible on early release
software (r0018 = 1.05).
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The second word of the PZD task telegram is the main setpoint
(HSW). This will be the main frequency setpoint provided the main
setpoint source is USS, (see parameter P1000).
There are two different ways in which this can be defined depending
on the setting of P2009 (“USS normalization”).
If this is set to 0, the value is sent as a hexadecimal number where
4000 (hex) is normalized to the frequency set in P2000.
If P2009 is set to 1, the value is sent as an absolute decimal value
(e.g. 4000 decimal (=0FA0 hex) is interpreted as 40.00 Hz.)