Siemens simatic hmi op7 Equipment Manual page 16

Alarm messages
Recipes
Help text
Logging
1-4
Alarm messages show, in contrast to event messages, critical machine states
dur ing production operations. Due to their urgency, they have to be acknowl-
edged before any other action is possible.
Alarm messages may contain process values. Process values are displayed
either numerically - for example
Motor speed 4500
or symbolically - for example
Motor speed too high,
where a specific control value is assigned to too high.
This type of message has a higher display priority than an event message. If
an alarm message is issued, any event message or screen that is being dis-
played is replaced with a flashing alarm on the display.
The classification of a message as an alarm message is made at the configu-
ration stage.
When a product is made up of various ingredients in certain ratios, this infor-
mation is stored in a so-called recipe.
Take orange juice for example. Its production and bottling requires that
orange concentrate and water be mixed in a certain ratio. These values are
stored as tags in a recipe.
Each recipe can be made up of several data records containing different va-
lues for the recipe.
The data can be edited in the OP, transferred to the PLC and read out from
the PLC.
In the OP, the recipes are combined by recipe number and title in a recipe
directory.
Help text consists of configurable additional information and operator in-
structions relating to event messages, alarm messages and screens. If for ex-
ample an alarm message arises, this enables additional information on how to
eliminate faults to be displayed.
Help text can also be displayed by pressing a key, if required, when the
HELP LED is on.
Messages can be printed in online mode by means of the printer connected to
the OP. Furthermore, there is a possibility of printing all the event and alarm
messages that have accumulated in the buffer concerned.
Equipment Manual OP7, OP17
Release 04/99