Chapter 3: Configuration 3.6 Setting the Configuration
493-0736-11 (6-2) 119
ESP
The ESPSignal input to the block allows you to specify an External Set Point from
different analog sources for use with the controller. Depending on the analog
source type, different indicators are displayed on the top row of the LCD display.
Table 84 Set Point Indicators
If the input ESPSignal = Off, the system disregards all External Set Point
parameters completely:
• the system will use ISP for Set Point,
• the setting of the ESPLock parameter is disregarded,
• the value of the ESPStatus output is invalid (if any inputs are connected to this
output, the SP block will signal a warning on the display),
• the ‘External Set Point’ and ‘ISP/ESP’ entries are removed from the Operator
Option List.
The object of the ESPLock parameter is to lock the controller in ESP mode.
Neither the operator nor the ESPEnable input must be able to switch into ISP
mode.
When ESPLock is On, the Set Point block permanently uses ESPSignal for Set
Point. The input ESPEnable is deactivated. Furthermore, the entries ‘Internal Set
Point’ and ‘ISP/ESP’ are removed from the Operator Option List, thus preventing
the operator from switching into ISP mode.
Source Type External Set Point Type Indicator
AI (analog input) Remote Set Point RSP
AIC (analog communication) Computer Set Point CSP
AU (analog user) Local Set Point LSP
Other than AI, AIC, AU External Set Point ESP
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